Demonstration Slide Rules Used for Teaching Classes |
These are enlarged versions of popular slide rule models that the manufacturers produced and provided to schools to aid in teaching the use of slide rules. They were excellent advertising tools for promoting the sales of the brand.Note: Images included here were photographed, scanned from catalogs, submitted by collectors, or found on the web to document all the varieties that exist. My apologies if pictures are not properly credited. Let me know so I can better document everything.
One of the most comprehensive collections I've seen are located in the office of
Radiologist Dr. 'Dalai' (nickname) in Columbia, South Carolina, graduate of Baylor University,
who first posted these on his interesting blog . |
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Shown are Aristo Junio, Aristo Bi-scholar, Unknown, and Faber Castell 52/80  Pictures courtesy of Segeo.de (Stephan Georgi) - Hamburg, Germany  This 120cmx40cm Aristo Tri-Log is from the Tweed Library Archive (UK).  Aristo TriLog 308 Courtesy of Prof. Dr. Jörn Lütjens  Faber Castell Model 315-83N Novo Duplex Demonstration Slide Rule. Located At Powerhouse Museum. |
 This picture is from a 1954 Aristo (German) catalog. Rechenschieber-Online-Museum (Ahrensburg, Germany)
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Aristo 203 Projection Rule for use in a Slide Projector. Projector model Lietz Prado is shown.
 REF Early Dietzgen Demonstration Slide Rule |
Early Dietzgen Demonstration Slide Rule Made in Bavaria. Has Railroad Track style divisions It appears to be a 4 foot long model. Ebay Photo  |
 REF 1760 Series Demonstration Slide Rule 
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1760 Series Demonstration Slide Rule The 7 foot long 1760 Series Demonstration Slide Rule was equivalent to a Mannheim Type 1768, with scales A, [ B, CI, C ], D, K, and [ S, L, T ] This one was owned by the IBM company and shows an asset tag. Archive - Photo donated by Darryl Willis 
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K&E demonstration slide rules, with Mannheim scales, date back as early as 1930,
when they appeared in the 1933 K&E catalogs as Model 100 and 101. (contributed by Clark McCoy).
the slide rules were typically made of Redwood, which is lighter in weight than
many other woods. The 1936 catalog, although listing just the Model 100 and 101, has a note at the bottom of the page stating Demonstration slide rules, with the scales of the K&E Log Log Trig (equivalent to the 4080) and Log Log Decitrig Slide Rules (equivalent to the 4081), are also available. The 1962 catalog, calls the 4053 Model 100 now as 69-1944, the 4081 Log Log Decitrig Slide Rules as 68-1923, and a new Demonstration Slide Rule for the Decilon 68-1100, called Model 68-1929 is now available.
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 1933 K&E Catalog |
 1936 K&E Catalog |
 1962 K&E Catalog |
 1967 K&E Catalog |
This Demonstration Slide Rule was found by Monroe Postman and is unique.
Although it looks like a Model 100 it is missing the K scale on the lower face.
This may be a match to a K&E 4053 prior to 1926 when the K scale was on the bottom
edge instead of on the face. Scales A, B, CI, C, D, S, L and T. 
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The model 100 was equivalent to a 4053-3, with scales A, B, CI, C, D, K, S, L
and T. By 1962 it was called Model 68-1944.
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The model 101 was equivalent to a 4070-3, with scales DF, CF, CIF, A, B, CI, C, D, K, S, L
and T. It was not mentioned in the 1962 catalog
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The model 68-1923 was equivalent to a 4081, with front scales: LL02, LL03, DF, CF, CIF,
CI, C, D, LL3, LLL2. Back scales: LL01, L, K, A, B, T, SRT, S, D, DI, LL1.
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North Carolina State University School of Mathematics John Wesley Cell, NSCU, 1960
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This model was equivalent to the Decilon 68-1100/68-1130, with front scales:
Sq1, Sq2, DF, CF, CIF, L, CI, C, D, Ln0, Ln1, Ln2, Ln3. Back scales:
Ln-3, Ln-2, Ln-1, Ln-0, A, B, T, SRT, S, C, D, DI, K.
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 Above Pictures courtesy of Sphere Research
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Pickett 4ft and 7ft slide rules are the most abundant and varied that one can find.
They were made of plywood with sheet aluminum bars holding the stock together. Pickett
gave one to every school that ordered 24 standard size slide rules, consequently
doing a great job of placing free advertising in every school in America. |
 From the Pickett Wall Mount Teaching Guide by Maurice Hartung |
 Down load the 48 page teacher's guide 
Pickett Teaching Guide (17.7MB)
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Model 2 (circa 1945) - 7 ft
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Model 500-ES - 4 ft Mike Konshak collection www.SlideRuleMuseum.com
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Model N803-ES Speed Rule - 7ft
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Model 902-ES Trig - 4ft
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Model 1010-ES - 7 ft  Donated to www.SlideRuleMuseum.com by Tom Grosh (on right), now located at the Computer History Museum. Notice another Pickett Trainer, a 4ft 500-ES reflected in the mirror with hoards of slide rules in the lower right corner.
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 Donated to ISRM by Thomas Corby (on right). Tom wrote: " I acquired the slide rule about 40 years ago from a friend in Pottsville, Pa. (My Birthplace). I was attracted to it since it was identical to one used at Indiana Institute of Technology in Ft. Wayne, IN where I obtained a BSME in 1959. "
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Model N4-ES - 7ft Courtesy of Ken, CEO, Acorn Product Development This is mounted in their office in Fremont, CA
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 N1010-ES Trig Details |
Hemmi Model 101 - 48 inches x 10 inchesSitting in ODELCO factory in the Phillipines. Pictures courtesy of Oscar de Leon, president of ODELCO
Model 1447D - Student, 4ftThe model 68-1923 was equivalent to a 1447, with front scales: A, B, CI, C, D. On the back was S, L, T.
Model 1447DA - Student, 6ftThe model 1447DA was equivalent to a 1447, with front scales: A, B, CI, C, D. On the back was S, L, T.
Model 1460 Versalog - Student, 7ftThe model 1460 was the most advanced Post Slide Rule, with Front Scales: LL/1, LL/2, LL/3 [ T/T, SecT/ST, Cos/S, C ] D, LL3, LL2, LL1 and Back Scales: LL0, LL/0, K, DF [ CF, CIF, CI, C ] D, R1, R2, L
Hemmi Model 260 - 5ftCollector Amedeo Muscelli, found this in a local Venezuelan shop. The 5 foot overall Hemmi 260 slide rule is made of wood and painted with an air brush using a template. The cursor is a one sided frame with a wire in the middle, this frame work hooked onto the top of the rule and had to be re-hung when the rule was reversed.
 Pictures courtesy of Sphere Research |
| Welch demonstration slide rules were made of 3 layers of masonite boards that were riveted together with five rubber feet on the back, for desk top manipulations. They are the only training slide rules with a black background and white scales. There are two known models, the most common have the divisions boxed in a 'railroad track' scheme, which was popular in pre-1940 slide rules. The second model has modern divisions as shown in the following photos. The modern scale divisions seem rarer than the boxed scales as the only one that has been found is here at ISRM. It is not known which is the earlier version. Very few models are found with original cursors and the model at ISRM has a replicated version made by the curator. |
Welch - 4ft Standard DivisionsISRM Collection
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Welch - 4ft Boxed (RR Track) DivisionsMost of these pictures were found on eBay.
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