ISRM is a 501(c)3 (A57 - Science and Technology Museums) entity through the State of Colorado. Colorado ID Number 20181884948, IRS EIN 83-2486423, operating as a non-profit corporation as International Slide Rule Museum dba ISRM. All donations to ISRM are tax deductible.
If you are wondering about the process of creating images for posting slide rules specimens, here is a 7 minute video captured from my screen while editing the many scans required to document a slide rule into one single image.ISRM Scanning Procedure Screen Capture
YYYY.MM.DD-## - Gallery - Description of Edits, Additions[Replacements], Gifts or Donations.
2023.03.27.01 - Received Acu-math No.47 yellow stock Mannheim. Oval logo.
2023.03.25.01 - Received Versalog 1460 dcJF belonged to Mel L. Frost, gifted by Les Frost and Marion Nurse.of Kanata, Ontario, Canada.
2023.03.11 - Pickett - Added[Replaced] 109-ES gift of Stephen Harper, added Bio of Father Dr.A.Edwin Harper. N526-ES StatRule gift of Eric Anderson.
2023.03.10 - K&E Added 4071T Polyphase Trig 1912 and 4088-3 Duplex Trig 1921.
2023.03.08.01 - Pickett - Received Pickett N-525-ES Stat rule 1965. Gift of Eric Anderson of Elmhurst, Illinois. Like new.Brown leather sleeve. - replaced 13.07.03.16
2023.03.07.01 - Acquired K&E 4071T DuplexTrig Lot98 (or 86) 1913 AGC w/leather sleeve marked "Dan Kuhn" [Replaced S431]
2023.03.01 - Received gift of slide rules from Michael L. Davis of Colorado Springs.
- 23.03.01.01 - K&E N4053 Polyphase Mannheim sn687975 Cursor block broken.w/intact black leather sleeve (restore/scrap)
- 23.03.01.02 - K&E 4092-3 Log Log Duplex trig sn 258174, Patent numbers lower face,All glass cursor. one lens has two broken corners (replaced both lens with acrylic) with intact brown leather sleeve "E.Paul Seydel" on flap. Fort Dodge Com College 1904 (Duplicate to 04.04.23.02)
- 23.03.01.03 - K&E 4092-3 Log Log Duplex trig sn 254635, Patent numbers lower face, New Improved Cursor, with brown leather sleeve, no flap "Ralph L. Renner" on stock. (Duplicate to 18.07.26.02)
- M - K&E 4161 manual
2023.02.28 - SR_WhosWho - Added Tom Martin's Birth and death year 91936-2023). He passed on January 1. Tom was a founding member of UKSRC. Added Irene Dennert's dates (1927-2022). She was of the Dennert family of Aristo.
2023.02.28 - Nestler - Added Nestler Slide Rule Date Tracing by Guus Craenen (IM1995 Proceedings) to bottom of page.
2023.02.28 - KE_Standard - Added 4090 2-slide Universal with edge cursor.
2023.02.28 - Yearbooks - New gallery. Created a mirror copy of People w/SRs in order to extract Academic yearbooks photos to reduce the size of the other ephemera galleries.
2023.02.28 - People w/SRs - Now at 1000 photos! Added 15 photos, 10 gleaned from sightings listed in an archive ISRG database, courtesy of Rod Lovett.
2023.02.28 - Aerospace - Added AT-9 and B-34/37 Load adjuster slide rules with reference photos from wikipedia. Scans by Noh Stegman of the Tri-Stae Warbirds Museum.
2023.02.24 - People/Ephemera - Harvested actors with slide rules that were mentioned in the ISRG data base on Rod Lovett's site.
2023.02.21 - SR Loaner - Sent 25ea Fedra Log Log to Michael feeback, GKentucky Governor's Scholar Program, Elkhorn Crosssing School, Georgetown, KY
2023.02.21 - UnitedStates - Added American Spring, Associated Spring and Connecticut Spring brands. Duplicated in Pickett and Acumath galleries.
2023.02.21 - UnitedStates - Added bio and slide rules belonging to Howard Malcolm Smith. Added bio for Wallace Barnes founder of Associated Spring.
2023.02.11 - Received Sterling 687 (587) pocket slide rule in retail package along with 3 other Sterling products. Gift of David Teuton. Belonged to father Max D. Teuton, 1953-1998.
2023.02.08 - SR_Course - Revised content and updated downloadable PDF of self-paced seminar with ISRM logo and minor web page changes.
2023.02.08.01 - Received Silver-Reed SR84 electronic slide rule calculator from Serbia.
2023.02.06.01 - Received Pickett 1000 ortho-phase duplex magnesium.Gifted by Jim Brandyberry of Indianapolis, IN. Belonged to father Howard W. Brandyberry (1913-1971).
Howard W. Brandyberry was a lifelong teacher and United States Army veteran who lived in Indiana from 1913 to 1971. He was also a high school basketball coach
2023.02.05 - Received slide rules belonging to Howard Malcolm Smith (1897-1966). Gifted by Bruce Moody of Fort Mill, South Carolina. .
- 23.02.05.01 - American Spring of Holly slide Rule (made by Acu-Rule)
- 23.02.05.02 - American Spring of Holly Spring Design Slide Rule Slide Chart Version
- 23.02.05.03 - K&E 4088-3 sn419109 (1933)with spring design aids on slide
- 23.02.05.04 - K&E 4053-3 Mannheim sn960135 (1953) modified as a spring design slide rule, usin a scale by by M.M.Smith.'39
- 23.02.05.05 - Pickett 160 Microline Promo: Electronic Fastenters, Inc on back - to duplicates
2023.02.04 - Nestler - Added 0254 Delta Log Log Slide Rule. Gift of Michael Rosenborg of Canyonville, Oregon
2023.02.04 - Post - Added 1447 DP Student Projection Slide Rule, with instructions and overlays. Gift of Michael Rosenborg of Canyonville, Oregon
2023.02.01 - Received gift of slide rules and Adders from Stephan A Harper. Belonged to Dr. A. Edwin Harper, Jr.(1919-2001) an eminent American psychometrician who worked
for the United Presbyterian Church of the USA.He spent his entire working career in India.Coauthor Dr A Edwin Harper, jr and Dr VS Misra, in their book 'Research on
Examination in India', published by NCERT
23.02.01.01 - Pickett 109-ES Circular with manual and black sleeve.replace ISRM 04.09.27.05 in gallery
| 23.02.01.02 - Lafayette Concise 270.with black sleeve. to gallery
| 23.02.01.03 - Takeda Concise 28 with sleeve and manual Takeda Drawing Instruments Mfg.To gallery replace C27
| 23.02.01.04 - DK Statistical Slide Rule. A cardboard slide chart by The Psychological Corp. ©1933, 1938 to gallery
| 23.02.01.05 - Universal Metric Converter Pencil cup. Duplicate
| 23.02.01.06 - Magic Brain Calculator with stylus (Japan) and instructions -duplicate
| 23.02.01.07 - Wizard Calculating Machine with wallet (Germany) MagicBrainInstand instructions.- duplicate
|
2023.01.24 - Began adding thumbnails to the galleries of the relevant Volumes of the Slide Rule Instructions Library.
2023.01.24 - Concise - Added No. 300 and Lietz branded 3626-25 Stadia Computer. Gift of Cindy Tate.
2023.01.23 - Aerospace - Finished adding 37 aviation flight computers, gifts of Cindy Tate (Victor B. Tate collection),
Andrienne Ervin (Kenneth Ervin Collection), JoAnn Lynn (Joel Lynn collection).
2023.01.19.01 - Received gift of Triumph LS826 Electronic (slide rule) calculator (Japan) from Patrick Craig of Dayton, Ohio. Belonged to Michael A Brady, Chief Geologist for Parsons.com
2023.01.05 - Aerospace - Restructured online gallery into several catagories for easier navigation to style.
2023.01.04 - We received the sad news that Irene Dennert (Aristo family) passed away on December 3, 2022.She was 95 years old.
2023.01.02 - Received slide rules for loaner program from Michael Rosenborg of Canyonville, Oregon Michael is a retired High School teacher
with a Master degree in mathematics. He re-gifted these slide rules to ISRM that were used in his classes. He received them fron a USENET group.
- 23.01.02.01 - Nestler Delta 0254. To gallery
- 23.01.02.02 - Post 1447DP Student Projection Slide Rule. to gallery
- Pickett Microline 120: 10 added to loaner kits
- Acu-Math 400: 5 added to loaner kits
- Sterling Mannheim 684: 5 added to loaner kits
- Post Mannheim 1447: 3 added to loaner kits
- Pickett Simplex Trig N902-ES: 1 added to loaner kits
- Sterling Decimal Trig Log-Log 594: 1 (scrap)
2023.01.01 - SR_Home and Library - Added Flight Computers Volume 35 Thumbnails.
2022.12.23 - Published Flight Computers Volume 35 on Amazon in paperback, hardcover and kindle (revised process - much improved)
2022.12.20 - Editing manuals for Volume 35 Flight Computers
2022.12.11 - Published K&E IV Volume 34 in paperback, hardcover and kindle (revised process - much improved)
2022.12.06.01 - Received Brother 718SR electronic calculator. sn F0092957. Made in Japan.
2022.12.06.02 - Received Privileg 585D-E electronic calculator. sn17352 distributed by Quelle in germany.
2022.12.06.03 - Received Santron 71SR electronic calculator.
2022.12.06 - Published K&E III Volume 33 in paperback, hardcover and kindle (revised process - much improved)
2022.11.28 - ISRM updates delayed due to COVID 10 day quarantine.
2022.11.24.01 - Received Omron 10SR Electronic "Slide Rule" calculator. Green VFD. With manual (EN & DE) and sleeve
2022.11.16.01 - Received Foxboro Valve Sizing slide rule 1939 Stainless steel. Gifted by Daniel Hirshfield of Turnbull, CT. belonged to father Joel Bentley Hirshfield.
2022.11.14.01 - Received Digi-Matic D-8 ESR Calculator. Sears, made in Japan.
2022.11.12.01 - Received Aero Products Research (APR) E6-3B Wind Triangle Computer.Made possible by a gift from Caroline Soles and John Phillips of High River, Alberta Canada.
John has retired, but used to own a small helicopter company called Cascade Rotors with his brother. Caroline used to be a scuba instructor, and is currently
learning how to fly.
2022.11.11 - Pickett - added N300-ES w/Modern logo. Gift of Leslie Dormanen.
2022.11.07.01 - Received a Bowmar MX-90 sn252588 (with mx-100 function keys) electronic calculator for upcoming book.
2022.11.04.01 - Received a Bowmar MX-100 sn202094 electronic calculator for upcoming book.
2022.11.03.01 - Received a Bowmar MX-90 sn246551 with charger and manual.
2022.10.29 - KE_Standard_Adde N<4053-5> 20-inch polyphase mannheim with flanged AGC. Gift of Cindy Tate.
2022.10.29 - Concise - Added[Replaced] Stadia Computer ISRG Herman van Herwijnen Memorial Edition 2004 with instructions. Gift of Frank W. Cole. 380 Radio Computer ISRG Edition (ebay photo.
2022.10.29 - Dietzgen - Added 1767P National (wood), 1768P Reliance (Mahagony/Charvoz-Roos), 1768-P (Plastic Fuji), Gifts of John Holmes and Leslie Dormamen.
2022.10.29 - Pickett - Added N4-T Vector Log flat lens, round black logo. Gift of John Holmes. N200-T Nat'l Science Teachers Assn. "Compliments of Pickett" gift Randall Kirschman
2022.10.29 - Aerospace - Added two Sillcock-Miller aviation True Air Speed calculators. 1943 Navy version Gift of John Holmes.
2022.10.29 - France - Added Marc-Unis 13cm mannheim Thin film cursor. Gift of John Holmes.
2022.10.29 - Graphoplex - Add 640 electric log log variant. Gift of John Holmes.
2022.10.29 - Received gift of 6 slide rules belonging to Leslie Dormanen of Wheaton, Illinois.add to accession numbers from 2022.10.13.XX
2022.10.28 - KE_standard - Added Mystery Mannhaeim, gift of Judy Johnson. N<4041&rt> gift of Cindy Tate. 4091-3 w/flanged cursor gift of leslie Dormamen.
2022.10.28.01 - Received Hanimax Electronic Slide Rule calculator.
2022.10.27 - Post - Added 1452 Universal c1940 Teledyne-Post 44CH-500 Versatrig, Gift of Cindy Tate. Post 1447 cWWII (Charvoz-Roos) Gift of Leslie Dormamen.
2022.10.27 - SIC SINCO - Added 1510 Astrolog w/square braces. Gift of Dave Zoumaras.
2022.10.27 - Ricoh - Added Engineer's 1510 Multilog Duplex. Gift of Leslie Dormamen
2022.10.26 - Hemmi - Added 50/1 Advanced Manheim (1928). .
2022.10.26 - Aristo - Added 967U w/transparent scales. Gift of Leslie Dormamen
2022.10.26 - Post - Added 1444-P and 1452-P (both made by Bruning). Gift of Cindy Tate. Teledyne-Post 1441 (Hemmi) gift of Leslie Dormamen
2022.10.26 - Nestler - Added Nestler's Universalschieber 1904 Scan By Andreas Fassbender
2022.10.25 - Nordic - Added Letter to Marvin Clarence from the Queen of Denmark in support of ISRM
2022.10.25 - KE_standard - Added N4053-3 Gift of Dave Zoumaras.
2022.10.24.01 - Received gift of Concise Stadia Computer herman van Herwijnen Memorial Edition 2004 by Frank W. Cole of Hutchinson, Kansas. replace 21.08.12.02
2022.10.20 - Ephemera - Corrected formating of rows 120-140
2022.10.15 - Received gift of a variety of slide rules and books belonging to Dave Zoumaras of San Diego, California. Belonged to father-in-law.
- 22.10.15.01 - Aristo D&P German Artillery Range finder 35cm slide rule - to military and aristo gallery
- 22.10.15.02 - SIC 1510 Log Log Astrolog no logo, no serial number. narrow cursor block, no scale labels on lens. "265" etched on brace. Replace P511
- 22.10.15.03 - Pickett N902-ES Duplex Trig Convex Lens, Black naugahyde sleeve - Duplicate to School Loaner sets
- 22.10.15.04 - Pickett 140-es microline Log Log Black naugahyde sleeve - Duplicate to school loaner sets
- 22.10.15.05 - Faber-Castel 57/87 Reitz schul-rechenstab dc564 (May 1964)- Duplicate of 9.01.12.60
- 22.10.15.06 - Pickett & Eckel 1000 polyphase Duplex sn 5F2177, Magnesium Triangle logo, rounded braces- slide is locked
- 22.10.15.07 - Dietzgen 1746 Maniphase sn708101 Type Multiplex, in retail box Duplicate
- 22.10.15.08 - K&E 4081-3 sn783239 1940 Log Log Duplex Decitrig - Orange sleeve, flap torn Name on flap "BUBEL" - duplicate of 15.07.07.01
- 22.10.15.09 - K&E N4053-3 sn859655 1941 Mannheim polyphase stock marked "BUBEL", has KERCS, - to be restored same stock as 11.12.14.01 (no magnifier) to gallery
- 22.10.15.10 - A. Lietz Company No.2974 Lawrence 250-BT to MiscUSA gallery
- 22.10.15.11 - Dietzgen pocket (1771 Redi-Rule_ made by Bruning 2401P missing cursor - scrap or restoration
- 22.10.15.12 - K&E 4097B Pocket Ever-There (Falling apart) scrap - Use good box and manual for a duplicate
- 22.10.15.13 - Post 1460 Versalog green COS,no serial number. Leather sleeve missing flap. Missing cursor - restore to duplicates
- 22.10.15.14 - Mascot 2-3/4" diameter Circular slide rule 1934 Cursor wrap is split (taped) - use for gift
- 22.10.15.M486 - Thompson,The Standard Manual of the Slide Rule second edition 1952 to isrm volumes
2022.10.14 - Received gift of a variety of 12 slide rules belonging to John Holmes of Washington, D.C.
- 22.10.14.01 - Dietzgen 1778 Pocket Duplex - Made in Germany version 1 cursor - Gallery
- 22.10.14.02/M487 - Graphoplex 640 System Electric Log Log Instructions in French - to gallery uses S640 scales
- 22.10.14.03 - Post 1460 Versalog dcDD.Apr 1953 black cos. no SN. slightly faded. Leather sleeve - Duplicate
- 22.10.14.04 - Pickett N4-T Vector Log Log flat-lens nylon-bars curved-braces round black logo Brown leather sleeve to gallery
- 22.10.14.05 - Dietzgen 1768P Reliance (Roos SR-105M) Painted mahogany stock, silksdcreened equivalents, no linear scales on back - to gallery
- 22.10.14.06 - Pickett N902-T Simplex Trig retail box (no slide rule added one from school set with a manual) - Duplicate
- 22.10.14.07 - K&E 4181-3 sn071122 plastic Log Log Duplec Decitrig. Orange leather sleeve with belt clip. "Charles Horr" inside flap. - Duplicate
- 22.10.14.08 - K&E 4181-3 sn059288 plastic Log Log Duplec Decitrig. green sleeve (tight). no markings. - Duplicate
- 22.10.14.09 - Pickett N902-ES Simplex Trig, - Duplicate to loaner
- 22.10.14.10 - Marc-Unis France Pocket mannheim 13cm Thin-Film cursor c1930 - to France gallery
- 22.10.14.11 - Concise CTSC-552 Sama &Etani Tables, 'Hooker" promo. "OXY" on sleeve. - duplicate
- 22.10.14.12 - Sillcocks-Miller Co. Aircraft Navigation Computer Mark 8, BU Aero U.S. Navy - to aerospace gallery
- 22.10.14.13 - K&E 4097C Ever-There with broken glass, swapped out lens from a 4097B cursor with KERCS. - duplicate
2022.10.13 - Received gift of a variety of 20 slide rules belonging to Leslie Dormanen of Wheaton, Illinois.
- 22.10.13.01 - Post 1460 Versalog dcDD.Apr 1953 green cos. no SN. slightly faded. Leather sleeve - Duplicate
- 22.10.13.02 - Engineers 1510 Log Log Decitrig dcOS-2 1968 - leather sleeve "Mark Helwig" under flap. - Duplicate
- 22.10.13.03 - Teledyne Post 1414 (Hemmi P280) dcTI - To gallery
- 22.10.13.04 - Aristo 967U Darmstadt transparent linear scale - To gallery
- 22.10.13.05 - Dietzgen 1768-P Mannheim Made by Fuji Japan - To gallery replace REF S402
- 22.10.13.06 - Pickett N4-ES Vector Type Log Lof, Square Braces, Triangle logo, Flat Lens - Duplicate
- 22.10.13.07 - Pickett 1010-T Rounded Braces Flat Lens Metal bars - Duplicate
- 22.10.13.08 - Pickett N1010-T Trig Red Inverse Scales, Square braces, Round black logo, flat lens, black naugahyde sleeve - Duplicate
- 22.10.13.09 - Acu-Math 400 Mannheim - to School loaner set
- 22.10.13.10 - Acu-Math 500 Mannheime, Metal braces has cigarette burn - to school loaner sets
- 22.10.13.11 - Acu-Math 511 Magnesium stock duplex cursor (restored lens.- dulicate
- 22.10.13.12 - Post 1444-P pocket Mannheim (Bruning 2401) - clean branded sleeve. Back marked "Robert L. Atkins" with cmath aids scratched in. - Duplicate
- 22.10.13.13 - K&E 4091-3 Log Log Decitrig sn455651 1934 Flanged all-glass cursor (Restored had newer Model L1 cursor) - to gallery
- 22.10.13.14 - K&E N4058W Beginner's Slide Rule. White painted back Circular No. 47 Equivalents - Duplicate
- 22.10.13.15 - Aristo No.89 Rietz dc 3LA4 1973 - duplicate same as 09.10.21.02
- 22.10.13.16 - Post 1446 Mannheim (Pre-WWII) - duplicate same as 11.12.15.02
- 22.10.13.17 - Post 1447 Plastic Cursor (Roos SR-105M) WWII - to gallery Replace S448
- 22.10.13.18 - Acu-math 1240 Pocket mannheim, black braces, no oval logo, white sleeve - duplicate of 11.11.06.02
- 22.10.13.19 - Pickett 140-ES Microline version 2 with red inverse scales - duplicate
- 22.10.13.20 - Pickett N-515-T CIE Cleveland Institute of Electronics - Duplicate
- 22.10.13.21 - Pickett N300-ES pocket Log Log curved braces, convex lens, modern logo - to gallery
- 22.10.13.22 - Pickett 902-ES - Duplicate to slide rule loaner
2022.10.10 - Added 50 slide rules to the duplicates for adoption page with thumnails of reference specimens.
2022.10.07 - Aerospace - Added - T.O.P Computer 1971, Jadur 10-second Flightmaster 1937. Telex E-6B FDF-57 1975.Gift of Andrienne Ervin.
2022.10.05 - Aerospace - Added Bastion Brothers Co. Dalton Mark VII Aircraft Navigation Computer. 1934. Gift of Andrienne Ervin.
2022.10.05 - KE_Standard - Added 4088-3 c1935 belonged to Kenneth Edward Ervin (1920-2002). Gift of Andrienne Ervin.
2022.10.05 - Aerospace - Added another B-24 bomber load asjuster slide rule with bios and photos of Kenneth Edward Irvin.
2022.10.04.01 - Received Pickett 200-T promotional "National Science Teachers ass, 1962 convention, compliments of Pickett" gift of Randall Kirschman, Ph.D.
2022.10.04 - KE_Standard - Added K&E 4080-3 Log Log Duplex Trig sn059302 1944 in retail box. Cindy Tate collection.
2022.09.27 - KE_Standard - Added[Replaced] 4031 5-inch mannheim, 68-1608 20-inch Polyphase and 4053-2 Mannheim 1924, Joel L. Lynn collection.
2022.09.27 - Post - Added[Replaced] 1451 Versatrig Pocket Duplex, Joel L. Lynn collection.
2022.09.27 - Dietzgen - Added[Replaced] 1757 Primatrig, personal slide rule of Joel L. Lynn (1943-2022)
2022.09.25 - updated Slide rules for sale/adopt page with additional offerings.
2022.09 24 - Received 3-D printed cursor blocks from Kenneth and Matthew Gilley.
2022.09.24 - KE_Standard - Added 68-1281 Jet-log and 68-1581 Jet=Math pocket slide rules. Gift of JoAnn Lynn.Joel J. Lynn Collection.
2022.09.23 - Pickett- Added B1 Powerlog /sleeve, N16/N600 Twinpack, N600-ES w/Magnifyer, and X-4 Exective Vectorlog. Gifts of JoAnn Lynn. Joel J. Lynn Collection.
2022.09.21 - Sent numerous slide rules to Trevor Penner of Hillsboro, Kansas for a demonstration.
2022.09.20 - Received gift of a slide rule collection from Andrienne Ervin belonging to her father who ran an FBO (airplane mechanic) in Utah .
- 22.09.20.01 - K&E 4088-3 sn417709 NIC Brown leather sleeve name inside flap "Ken Ervin".- to KE_Standard gallery with bio and photos
- 22.09.20.02 - Cox & Stevens B-24 Bomber Load Adjuster sn57525 w/sleeve U.S. Government - to aerospacee gallery with bio and photos
- 22.09.20.03 - Lawrence Unmarked (wood)
- 22.09.20.04 - K&E N4053-3 NIC sn558181 missing parts of inch scale - to scrap
- 22.09.20.05 - Bastion Bros Dalton Mark VII w/ case
- 22.09.20.06/M - Jardur 10-Second. "Flight Master" w/ instructions to future Air Navigation Volume.
- 22.09.20.07 - Timm Pocket Position Plotter
- 22.09.20.08 - Jepco Avigation Plotter PV-2
- 22.09.20.09 - Flight Navigator-Cable Airport
- 22.09.20.10 - Eaton Torque and Energy Calculator
- 22.09.20.11 - AOPA Cruising Altitudes for Magnetic Courses (MSL) (#3)
- 22.09.20.12 - Denalt Takeoff/Climb Calculators (#3)
- 22.09.20.13 - Snyder Plotter
- 22.09.20.14 - Harry H. Knepper Aerial Dead Reckoning Computer w/ case
- 22.09.20.15/M488 - Things Co. E-6B Flight Computer w/ instructions
- 22.09.20.16/M - Telex E-6B 1975 5-inch dia Flight Computer Model FDF-57 w/ instructions and sleeve - Duplicate
- 22.09.20.17/M469 - Telex E-6B 1975 5-inch dia Flight Computer Model FDF-57 w/instructions and sleeve Marked "N3322F Ken Ervin" (tail number)to gallery
- 22.09.20.18 - Fritz_T.O.P. Computer 1971 Takeoff Performance Computer w/ instructions
- 22.09.20.19/M492 - Grumman American Flight Computer w/ instructions marked A/C N3322F
- 22.09.20.20 - Rolling Ruler w/ instructions
- 22.09.20.21 - Felsenthal CPU-26A/P Computer Air Navigation 2.5-in wide_w/ case
- 22.09.20.22/M489 - Jeppesen Computer CR-3 Computer (6") - w/ 1940 instructions and case
- 22.09.20.23 - Jeppesen Computer CR-2 Computer (4") - w/ case
- 22.09.20.24 - Sterling Precision w/ instructions
- 22.09.20.25 - National Aeronautical Institute Plotter
- 22.09.20.26 - Navigation Chart NP-13 Plotters (3)
- 22.09.20.27 - Weems Aircraft Plotter Mark II
- 22.09.20.28 - Cable Airport (Upland, CA) Flight Navigator
2022.09.18 - Acquired an aluminum clad 7-foot slide rule while passing through Boise, Idaho. No manufacturer's marking but is similiar to Pickett design.
2022.09.13 - Received gift of a slide rule collection from JoAnn Lynn from Washington, DC., in memory of her husband Joel J. Lynn (1943-2022)
.
- 22.09.13.xx - Many Pickett and K&E in in NOS boxes, replacement K&E indicators.
- 22.09.13.01 - Pickett X-4 Executive Vectorlog in desk case. To gallery
- 22.09.13.02 - Pickett B-1 Decitrig Log Log Bamboo (made by Ricoh) with leather sleeve. To gallery
- 22.09.13.03 - Pickett N600-ES Magnifying lens, Curved brace, Round yellow logo. Maroon sleeveTo gallery.
- 22.09.13.04 - Pickett N200-T Pocket Trig NOS. hooked braces, convex lens, modern logo. Black sleeve. duplicate
- 22.09.13.05 - Pickett N300-T Pocket Log Log NOS. hooked braces, convex lens, modern logo. Maroon sleeve w/clip. duplicate
- 22.09.13.06 - Pickett N1006-T Pocket Trig NOS. curved braces, convex lens, Round Black logo. Maroon sleeve w/clip (has black stain on clip). Duplicate
- 22.09.13.07 - Pickett N525-T Stat Rule. NOS Reatil box, black sleeve, manual. Duplicate
- 22.09.13.08 - Pickett N800-ES Log/Log Exponential NOS retail box, Modern logo.manual tan leather sleeve. Duplicate
- 22.09.13.09 - Pickett N803-T Dual Base Log/Log NOS retail Box. Round black logo, curved braces, manual tan leather sleeve. Duplicate
- 22.09.13.10 - Pickett N903-T Trig Conversion NOS Retail Box, Round black logo. Curved braces. Clear Convex lens. naugahyde sleeve. Manual. Duplicate
- 22.09.13.11 - Pickett N904-T Trig Exponential (Decimal Keeper) NOS Retail Box, Round black logo. Curved braces. Clear Convex lens. naugahyde sleeve. Manuals. Duplicate
- 22.09.13.12 - Pickett N803-T/N600-T Dual Rule Matched Set (Missing 600-T so added 22.05.06.31 to complete set.) - Duplicate
- 22.09.13.13 - Pickett N500-T/N300-T Log Log Rule Two Paired Set in NOS Retail Box Modern logos Suede sleeves - Duplicate
- 22.09.13.14/M485 - Pickett N16-ES/N600-ES Twin Pack Eye saver yellow. NOS in Retail Box. Maroon sleves, belt clip. Curved braces. new N-16 manual- To gallery
- 22.09.13.15 - Pickett N3-ES/N3P-ES TwinPack Eye-Saver Yellow Gold and black box.. Curved braces, modern logo, maroon sleeves. - Duplicate
- 22.09.13.16 - Pickett N3-ES/N600-ES TwinPack Eye-Saver Yellow Gold and black box.. Curved braces, modern logo, maroon sleeves. - Duplicate
- 22.09.13.17 - Pickett N4-ES/N600-ES TwinPack Eye-Saver Yellow Gold and black box.. Curved braces, modern logo, maroon sleeves. - Duplicate
- 22.09.13.18 - Pickett N3P-ES Power log Exponential, Unopened polybag. Maroon sleeve
- 22.09.13.19 - Dietzgen 1757 Primatrig. Personal slide rule of Joel L. Lynn. Marked "Middle Caswell" - Replace 12.05.06.02
- 22.09.13.20 - K&E 68-1608 20-inch Modern Polyphase sn510171 c1962-1975 Orange leather sleeve (Replace L07) - To Gallery.
- 22.09.13.21 - K&E 68-1210 NOS Decitrig Log Log in retail box w/hard cover manual, sleeve, belt clip, - Duplicate
- 22.09.13.22 - K&E 68-1210 NOS Decitrig Log Log in retail box w/hard cover manual, sleeve, belt clip, - Duplicate
- 22.09.13.23 - K&E 68-1210 NOS Decitrig Log Log in retail box w/hard cover manual, sleeve, belt clip, - Duplicate
- 22.09.13.24 - K&E 68-1210 NOS Decitrig Log Log in retail box w/hard cover manual, sleeve, belt clip, - Duplicate
- 22.09.13.25 - K&E 68-1210 NOS Decitrig Log Log in retail box w/hard cover manual, sleeve, belt clip, - Duplicate
- 22.09.13.26 - K&E 68-1210 NOS Decitrig Log Log in retail box w/hard cover manual, sleeve, belt clip, - Duplicate
- 22.09.13.27 - K&E 68-1210 NOS Decitrig Log Log in retail box w/hard cover manual, sleeve, belt clip, - Duplicate
- 22.09.13.28 - K&E 68-1210 NOS Decitrig Log Log in retail box w/hard cover manual, sleeve, belt clip, - Duplicate
- 22.09.13.29 - K&E 68-1261 Jet-Log Jr sn137788 Pocket Duplex Decitrig LL NOS - To gallery
- 22.09.13.30 - K&E 68-1581 Jet-Math sn030576 Pocket Modern Polyphase - To Gallery
- 22.09.13.31 - K&E 4081-5 20-inch LogLog Duplex Decitrig sc537213 Orange Leather sleeve missing flap - Duplicate
- 22.09.13.32 - K&E 68-1261 Jet-Log Jr sn137788 Pocket Duplex Decitrig LL NOS no model number on slide. Orange sleeve.1962-1975 - duplicate
- 22.09.13.33 - K&E 68-1130 Decilon 5, sn 047618 Orange vest pocket sleeve w/clip - Duplicate
- 22.09.13.34 - K&E 68-1555 Doric (was 9068) sn049545 duplex, orange sleeve - duplicate
- 22.09.13.35 - K&E 4031_AGC 5in 10cm sn92226 Eearly equivalent label. to gallery
- 22.09.13.36 - K&E 4150-1 sn025677 Green sleeve w/pocket clip - Duplicate
- 22.09.13.37 - Post 1451 Versatrig Pocket Duplex - Replace REF in gallery
- 22.09.13.38 - Odelco (Hemmi) 15cm pocket - to gallery
- 22.09.13.39 - AW Faber 63/91/338/A 5-inch dc 3-37, thin film folded celluloid cursor - Duplicate
- 22.09.13.40 - Dietzgen 1737 Decimal Trig Log Log bamboo - duplicate
- 22.09.13.41 - K&E 4088-3 Polyphase duplex Lot357, AGC, sleeve for magnifier, flap missing. - duplicate
- 22.09.13.42 - K&E 4160 Chemists Rule All-Glass Cursor sn285755 c1929 sleeve missing flap - duplicate
- 22.09.13.43 - K&E 4053-2 Polyphase Lot46 NIC (s/b AGC) to gallery (Replace S251 if AGC can be found)
- 22.09.13.44 - K&E 4080-3 Log Log Duplex Trig (minutes/seconds) sn125236 1945 (1939-1947 scale set) - duplicate
- 22.09.13.45 - K&E 68-1215 Decitrig Log Log in used retail box w/hard cover manual, sleeve, with belt clip,
- 22.09.13.46 - K&E 4081-3 Duplex Log Log Decitrig sn661143 1938 w/ leather sleeve - Duplicate
- 22.09.13.47 - K&E 4054 Polyphase sn182972 (1946). NIC. Intact Black hard sleeve, green retail box - duplicate
- 22.09.13.48 - K&E N4041 Mannheim sn833838 (1941). NIC. Black hard sleeve, - duplicate
- 22.09.13.49 - Dietzgen 1757 Primatrig Tan Leatherette sleeve - duplicate gift to M. Gilley
- 22.09.13.50 - Pickett N600-ES LogLog Hooked braces, convex lens. - duplicate M. Gilley
- 22.09.13.51/M493 - Jeppesen Model CR-2 Computer ©1955 3.75-inch dia, Ray Lahr Patent BR-4 Manual (for Volumes)
- 22.09.13.52 - Jeppesen Model CR-5 Computer ©1955 4.38-inch dia, Ray Lahr Patent. - Duplicate (re:Tate collection)
2022.09.08 - Published Volume 30 - Slide Rule Catalogs 1881-1939. Available on Amazon
2022.09.06 - Working on compiling slide rule catalog pages for Volume 30 1881-1939 and Volume 31 1940-1970.
2022.09.01 - Received Slide rules and manuals, with photo and bio, from Ronald Ropke (6-11-2042 - )of Grosse Pointe, Michigan,
- 22.09.01.01/M - Pickett & Eckel Model 3-T Dual-Base Log Log Reciprocal Scale - Aluminum stock, Steel cursor , flat lens.
- 22.09.01.02/M - Pickett & Eckel 1010-T Aluminun Stock Case braces and cursor blocks.
- M484 "Slide Rule" By C.L. Johnson Spiral bound text book for sel Instruction. 1953-1960
2022.08.27 - Received Slide rules and manuals, with photo and bio, from Tove and Lise King of Carlsbad, California.
Belonged father-in-law Radm.Randolph Winchester King (1923-2017), son of Capt. Thomas Starr King, USN (ret).
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