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 . 
Shown are Aristo Junio, Aristo Bischolar, Unknown, and Faber Castell 52/80 Pictures courtesy of Segeo.de (Stephan Georgi)  Hamburg, Germany This 120cmx40cm Aristo TriLog is from the Tweed Library Archive (UK). Aristo TriLog 308 Courtesy of Prof. Dr. Jörn Lütjens Faber Castell Model 31583N Novo Duplex Demonstration Slide Rule. Located At Powerhouse Museum. 
This picture is from a 1954 Aristo (German) catalog. RechenschieberOnlineMuseum (Ahrensburg, Germany)

Aristo 203 Projection Rule for use in a Slide Projector. Projector model Lietz Prado is shown.
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 691944, the 4081 Log Log Decitrig Slide Rules as 681923, and a new Demonstration Slide Rule for the Decilon 681100, called Model 681929 is now available.

1933 K&E Catalog 
1936 K&E Catalog 
1962 K&E Catalog 
1967 K&E Catalog 
The model 100 was equivalent to a 40533, with scales A, B, CI, C, D, K, S, L
and T. By 1962 it was called Model 681944. 

The model 681923 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. 
North Carolina State University School of Mathematics John Wesley Cell, NSCU, 1960

This model was equivalent to the Decilon 681100/681130, with front scales:
Sq1, Sq2, DF, CF, CIF, L, CI, C, D, Ln0, Ln1, Ln2, Ln3. Back scales:
Ln3, Ln2, Ln1, Ln0, A, B, T, SRT, S, C, D, DI, K. Scans courtesy of Clark McCoys K&E Catalogs 
Above Pictures courtesy of Sphere Research

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) 
Model 2 (circa 1945)  7 ft


Model 500ES  4 ftMike Konshak collection www.SlideRuleMuseum.com
 
Model N803ES Speed Rule  7ft
 
Model 902ES Trig  4ft
 
Model 1010ES  7 ftDonated to www.SlideRuleMuseum.com by Tom Grosh (on right), now located at the Computer History Museum. Notice another Pickett Trainer, a 4ft 500ES reflected in the mirror with hoards of slide rules in the lower right corner.
 
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. "


Model N4ES  7ftCourtesy of Ken, CEO, Acorn Product Development This is mounted in their office in Fremont, CA

N1010ES 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 681923 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 rehung 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 pre1940 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  
Welch  4ft Boxed (RR Track) DivisionsMost of these pictures were found on eBay. 


