Lawrence Engineering Instruments
1935 - Wabash, Indiana, 1938-1947 - Peru, Indiana
A 10 person shop owned by George Lee Lawrence and Vivian C. Lawrence
After a divorce became Engineering Instruments, Inc. 1947-1967 Peru, Indiana
Owned by Vivian C. (was Lawrence) Bozarth and Frank H. Bozarth

REF Lawrence 8-A	Lawrence 8-A Made in USA - Wabash, Ind. - 1935-1937 Front Scale A [ B, C ] D Back: Conversion Chart Archive - Tom Dilatush Collection
S028 Lawrence 8-B	Lawrence 8-B Made in USA - Wabash, Ind. - 1935-1937 Front Scale A [ B, CI, C ] D, K Back: Conversion Chart
P001 Lawrence Pocket	Lawrence Pocket - 1964 Made in USA Front Scale A [ B, CI, C ] D, K Back: Blank Scans and Photos Contributed by Vern Estes. This model was sold for $.40 each in the 1964 Estes Industries Model Rocketry Catalog. Vernon Estes founded the company on encouragement from G. Harry Stine, who founded the National Association of Rocketry (NAR) in 1958. Many rocketeers (including the ISRM Curator) were introduced as teenagers to slide rules through the Estes Technical Reports to calculate model rocket performance.
P173 Lawrence 6-0p Flashrule	Lawrence 6-0p Flashrule Made in USA - (c)1946 Front Scale ASA [ Shutter speed (5 scales), Feet ] F stop Back: Blank
S323 Lawrence 8-L Voltage Drop Motor Wiring	Lawrence 8-L Voltage Drop Motor Wiring Made in USA - (c)1946 Front Scale Distance to Load [ Load (Amperes), Voltage Drop % ] Cu Wire Size Back: Motor and Wire Data
S499 Lawrence 8-B Dumont	Lawrence 8-B Dumont Made in USA by Lawrence for Dumont, Zanesville, Ohio Front Scale A [ B, CI, C ] D, K Back: Conversion Chart
S322 L.E. Waddington Musicians Rule	L.E. Waddington Musicians Rule Made in USA - by Lawrence, Peru, Ind.- 1947 Front Scale: Semitone Count, Chromatic Notation [ Chords: Major, Minor, Augmented, Diminished ] Chromatic Notation/Subscript, Piano Key Back of Slide: Interval Ratios, Harmonic Series, Octaves Back: Subscript Notation, Instrument tables Well: Reference Frequency
S386 Lawrence 10-B	Lawrence 10-B - c1942 Made in USA - Peru, Ind.- Note: 8-B graphics on back Front Scale A [ B, CI, C ] D, K Back: Conversion Chart
S029 Lawrence 10-B	Lawrence 10-B - Glass Magnifying Cursor c1940 Made in USA - Peru, Ind. Front Scale A [ B, CI, C ] D, K Back: Conversion Chart Note: This glass magnifying cursor is very rare and was later replaced by an injection molded plastic magnifier. The molding machines were not transferred to Engineering Services after the 1947 Divorce settlement.
S543 Lawrence 10-B Magnifying Cursor	Lawrence 10-B - Plastic Magnifying Cursor c1942 Made in USA - Peru, Ind. Front Scale A [ B, CI, C ] D, K Back: Conversion Chart
REF Lawrence 10-C Engraver's and Photographer's Proportional Calculator	Lawrence 10-C Engraver's and Photographer's Proportional Calculator Made in USA - Peru, Ind. - circa 1946 Front Scale Original Size) [ Copy Size, % Size ] % Area Back Adv: Philips & Jacobs Chemicals Archive - Scan provided by Barry Mcallister
REF Lawrence 10-G Cutting Speed Calculator	Lawrence 10-G Cutting Speed Calculator 1946 Made in USA - Peru, Ind. Front Scale Cutting Speed (fpm) [ Diameter: Inch, Millimeters, Drill Size ] Spindle Speed (rpm) Back Adv: Gargoyle Lubricants Archive - not in collection.
REF Lawrence - Dupont 11-B	Lawrence - Dupont 11-B Made in USA for Dupont Chemicals Note: Same as Dietzgen 1767P National Front Scale A [ B, CI, C ] D, K Back Scale [ S, L, T ] Back: Conversion Chart Archive - Not in Collection
REF Lawrence - Copyfitter 12-H	Lawrence - Copyfitter 12-H Made in USA for Taylor Publishing Co., Centerville, Ohio Front Scale Measure Length of Picas [ Number of Lines, Length in Points, C.P.P. ] Characters, type size Archive - Tom Dilatush Collection
S495 Lawrence 505 U.S. Navy	Lawrence 505 U.S. Navy Made in USA - Peru, Ind. (Lawrence) Painted wood body Front Scale A [ B, CI, C ] D, K Back Slider [ S, L, T ] Back: Conversion Chart
S030 Lawrence 250-BT	Lawrence 250-BT Made in USA - Peru, Ind. c1942 Front Scale A [ B, CI, C ] D, K Back Slider [ S, L, T ] Back: Conversion Chart

Engineering Instruments, Inc. 1947-1967 Peru, Indiana

P185 Engineering Instruments Codemaker	Engineering Instruments Codemaker Made in USA by Engineering Instruments, Peru, Ind. Front Scale Alphabet [ Alphabet, Alphabet Inverted, Numbers ] Numbers Back: Blank
P190 Dick Tracy Secret Code Maker	Dick Tracy Secret Code Maker Made in USA by Engineering Instruments, Peru, Ind. Front Scale Alphabet [ Alphabet, Alphabet Inverted, Numbers ] Numbers Back: Blank Came with Magnifying Glass Instructions 2.18MB PDF
S031 Engineering Instr. 250-BT	Engineering Instruments 250-BT Made in USA - Peru, IN. Front Scale A [ B, CI, C ] D, K Back Slider [ S, L, T ] Back: Conversion Chart
S032 Engineering Instr. 250-BT	Engineering Instruments 250-BT- New all plastic cursor Made in USA - Peru, Ind. Front Scale A [ B, CI, C ] D, K Back Slider [ S, L, T ] Back: Conversion Chart
S195 Engineering Instr. 250-V	Engineering Instruments 250-V Made in USA - Peru, Ind. K&E 4058 cursor and sleeve (was Eng. Inst. an OEM to K&E?) Plastic laminate over wood body Front Scale A [ B, CI, C ] D, K Back Slider [ S, L, T ] Back: Conversion Chart
S265 Gene Loewy 10-B	Gene Loewy 10-B (Circa 1954) Made in USA by Eng. Inst. for Gene Loewy, New York, NY Front Scale A [ B, CI, C ] D, K Back: Conversion Chart
S528 Miller Motor - Air and Hydraulic Calculator	Miller Motor - Air and Hydraulic Calculator - Copyright 1950 Made in USA by Eng. Inst. for Miller Motor Co. Melrose Park, IL Front Scale DIA, A [ B, CI, C ] D, GAL Back: Conversion Chart
REF C.V. Ore S-M	C.V. Ore - Copyright 1955 Made in USA by Eng. Inst. for C.V. Ore, Harvey, ILL Front Scale DS [ CI, C ] D, DM Back: Conversion Chart Archive - David McFarland collection See the Acu-Rule section for a later plastic version.

Brief history

1901 - George Lee lawrence born in Chicago, IL.
Pre 1935 - Lawrence Slide Rule Company - George Lee Lawrence makes Photographic Slide rules in Chicago.
1935 - Lawrence Engineering Services was set up in Wabash, Indiana
1938 - Moved to nearby Peru, Indiana (10 man shop run by Ed Snyder)
c1940 - A glass magnifier was developed
c1942 - OEM supplier to Post (model 1446D) during WWII, when Japanese importation was halted. c1943 - Injection molded plastic cursor replaces fragile glass magnifier
1947 - A divorce settlement gives company to wife Vivian, briefly called Lawrence Engineering Company
c1948 - Vivian marries Frank C. Bozarth, forms Engineering Instruments, Inc. in Peru, Indiana
c1960 - Engineering Services OEM's the 77A plastic American Log Log (Acu-math 1500)
1967 - Company building burns down, Engineering Instruments ceases to exist.
1976 - George Lee Lawrence dies