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There are not many specimens from Geo. W. Richardson Rule Works, but his design style and short period of doing business is uniquely Americana, and deserves his own gallery. |
![]() Manual signed by the Inventor: George W. Richardson Jan 11, 1910, "To Mr. Bronlow, with compliments of the builder Geo, W, Richardson, Chicago, Illinois".
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A letter of endorsement from George Richardson to The International Correspondence Schools, of Scranton, PA Dated April 5, 1920. Donated by Chris Spannbauer, Barre, VT. George mentions being able to own a "Winton Six" automobile. An ad from 1914 shows what this car looked like.
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![]() Richardson Death Notice, 1940 |
Note: There has been much speculated about the relationship between Richardson and Gilson,
as both companies used at one time the "Be Wise" owl on the back of their manuals.
In the above endorsement to I.C.S., George mentions that he was able
to retire after selling his company,which had to be before the 1920 date. He
is obviously writing this endorsement after the sale in order to promote
his slide rule design for the new owners. Richard A. Gilson, son of of the
founder of Gilson Slide Rule Company, states in a letter to Bobby Feazel
(published by Oughtred Society Vol. 2, No. 2, 1993) that they made an 11" Richardson
straight rule for I.C.S. The only conclusion, therefore is that Gilson Slide Rule
Company purchased Richardson Rule Works prior to 1920. Both Richardson and Gilson were
family owned and run businesses, having created slide rules different from what was being
produced at the time. They would have been like minded and kindred spirits. George W. Richardson died
September 21, 1940, his obituary in the Chicago Tribune listed the same address was his business in 1911. I estimate he died at 75 years of age, having retired at 54 when he sold his business around 1919. This would put his birth around 1866. He was a veteran of the Spanish-American War of 1898 and ended his Naval service, soon thereafter, as a Chief Electrician, beginning his formal education at 33. He married Clara Knief. He had a son, Harold K. Richardson and a grand daughter Lynn Clair (Richardson).
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![]() S384 Geo. W. Richardson's Direct Reading Slide Rule |
Geo. W. Richardson's Direct Reading Slide Rule - 1909 Made in USA - Aluminum sheet body - reinforced celluloid sheet slide. Keyed holes for conversions and solving problems. Front Scale: A [ B, C ] D Double Hairline Glass Cursor Back: Problem Key Table for common equations. Archive - No longer in Collection |
![]() S497 Geo. W. Richardson's Direct Reading Slide Rule |
Geo. W. Richardson's Direct Reading Slide Rule - 1910 - Patent Pending Made in USA - Aluminum sheet body - reinforced celluloid sheet slide. Keyed holes for conversions and solving problems. Front Scale: A [ B, C ] D Plastic film Cursor with snap-over sheet metal frame Back: Problem Key Table for common equations. Archive - Donated to Smithsonian Museum, Washington, DC |
![]() S568 Geo. W. Richardson's Direct Reading Slide Rule |
Geo. W. Richardson's Direct Reading Slide Rule - Jan 31, 1911 Patent Made in USA - Aluminum sheet body - reinforced celluloid sheet scales. Keyed holes for conversions and solving problems. Front Scale: A [ B, C ] D Plastic film Cursor with snap-over sheet metal frame Back: Problem Key Table for common equations. Note differences on this production year: Grommets on two piece reinforced celluloid and aluminum slide, George's name less pronounced than before Union label on back - The only slide rule known to have a union label |
![]() P230 Geo. W. Richardson's Direct Reading Slide Rule (Pocket) |
Geo. W. Richardson's Direct Reading (Pocket)Slide Rule - 1912 Made in USA - Richardson Rule works - 1911/1912 Stock: Stainless Steel, Cursor: aluminum with clear celluloid lens, Scales: Opaque printed celluloid, Keyed holes for conversions and solving problems. Front Scale A [ B, C ] D |
![]() S523 Richardson 812 Pantocrat Mannheim |
Richardson 812 Pantocrat Mannheim Made in USA - all sheet steel construction Keyed holes for conversions and solving problems. Front Scale Sin, A [ B, C ] D, Tan, Log Back: Blank (label torn off) |
![]() REF Geo. W. Richardson's Direct Reading Slide Rule |
Geo. W. Richardson's Direct Reading Slide Rule - 1912 Made in USA - Richardson Rule works - 1911/1912 Stock: Stainless Steel, Cursor: aluminum with clear celluloid lens, Scales: Silksreen Aluminum, Keyed holes for conversions and solving problems. Front Scale Sin, A [ B, C ] D, Tan, Log Archive - Scan contributed by Peter Fox (UK) |
![]() S109 Richardson 1776 |
Richardson Rule works 1776 - Simplex Made in USA - all sheet steel construction. Keyed holes for conversions and solving problems. Front Scale K, Sin, A [ B, CI, C ] D, Tan, Log Back: Problem Key Table for common equations. |
![]() S285 Richardson 1776 Pantocrat |
Richardson 1776 Pantocrat - Patents 1911, 1912 Made in USA - all sheet steel construction. Keyed holes for conversions and solving problems. Front Scale Sin, A [ B, CI, C ] D, Tan, Log Back: Problem Key Table for common equations. |
![]() S414 Richardson 1776 Pantocrat Dual Slides |
Richardson 1776 Pantocrat Dual Slides Made in USA - all sheet steel construction, interchangeable slides Keyed holes for conversions and solving problems. Front Scale (Slide #1) K, A [ B, CI, C ] D, Tan, Log Front Scale (Slide #2) K, A [ C, LL1, LL2, LL3 ] D ] Tan, Log Back: Problem Key Table for common equations. |
![]() S496 Richardson 1812 Pantocrat Mannheim |
Richardson 1812 Pantocrat Mannheim Made in USA - all sheet steel construction Keyed holes for conversions and solving problems. Front Scale (Slide #1) Sin, A [ B, ±, C ] D, Tan, Log Back: Blank ![]() |
![]() S415 Richardson-Gisholt Time Computer |
Gisholt Time Computer Made in USA By Gisholt Machine Co., Madison, WI This is thought by some to have been made by Richardson, but it is based on a 10-10-1920 patent, that alters from Richardson's, by having two slides.
All sheet steel construction, dual nested slides. |

| L06 Geo. W. Richardson Military Slide Rule - Model 1917 Made in USA by Geo. W. Richardson for J. H. Weil & Co. Front Scale: A (Yards or Meters) [ B (Mils) C ] D (Yards or Meters) Back Scale: [ B (Mils) C ] Note: This was not designed for a sliding cursor Archive - No longer in Collection |
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