This page includes rules from Albert Nestler, Dennert & Pape (Aristo), Gebruder Wichmann, Reiss, VEB Mantissa and IWA.

Albert Nestler A G No 14 closed frame ten inch wood and celluloid slide rule, probably dating from the 1920s/1930s. Scales are: A{B,C1,C}D//{S,L,T}. There are inch and metric rulers on the edges and tables on the reverse. It has a black card case.

Spencer-Bonecourt Waste Heat Recovery Plant promotional four inch closed frame wood & celluloid slide rule: Scales are: A{B,C}D//{S,L,T}. There are inch & metric rulers on the reverse.

It has a black card case.

Identified as a Nestler No 41 Lilliput slide rule.

Identified as a Nestler No 41 Lilliput slide rule.

Albert Nestler AG No 37 Electro closed frame 10” wood and celluloid rule, probably dating from the 1930s. Scales are: inches\V,A{B,C1,C}D,U//{S,ST,T}\LL2,K. There is a centimetre ruler in the well. The rule has a black card case.

Ten inch mahogany & celluloid, closed frame slide rule and black cloth covered card case. The scales are: cm\A{B,C}D\in//{S,L,T}. The cursor, of aluminium and celluloid, has been bent and is not a perfect fit so may be a replacement. Probably German and probably by Nestler. Pre WWI. Possibly imported by Thornton.

Aristo Nr 968 Studio duplex plastic ten inch slide rule dating from 1955. Scales are: LL01,LL02,LL03,A{B,L,K,C}D,LL3,LL2,LL1//T,ST,DF{CF,C1F,C1,C}D,P,S. Complete with gray cloth covered card case.

Aristo Nr 0903 Scholar open frame simplex plastic slide rule dating from 1961. Scales are: L,K,A{B,C1,C}D,S,ST,T. There are inch & cm rulers on the reverse. Complete with gray cloth covered card case.

IWA Sonderrechenstab SR701 “Maschinenzeit”, Entwurl F Bahlecke. A machining time calculator (German language) with two slides. There are details on the reverse for different machining processes (badly worn). It is missing its cursor. IWA made lots of specialist calculators and still make slide charts. Obtained from Germany.

Reiss Progress 3223 duplex aluminium ten inch slide rule. It has a vinyl case. Scales are: A,DF{CF,C1,C}D,L//T1,T2{LL1,LL2,LL3}D,S. Obtained from Germany.

VEB Mantissa Aufsatz Entfernung Basis (range basis) artillery slide rule with nine specialist scales made for the former East German army. Gray cloth covered card case.

VEB Mantissa 1731541 Mono Rietz plastic, open frame, simplex 10” slide rule. Scales are: L.K.A{B,C1,C}D,S,ST,T. Gray cloth covered card case.

Wichmann No 1427 System Rietz pear wood and celluloid closed frame 10” slide rule. Scales are: cm\K,A{B,C}D,L\1:25//{S,ST,T}. Almost certainly made by Faber Castell. It has their date code for January 1941 in the usual places, the construction is the same, as are the dimensions, the type face, the cursor construction and the card case. Basically a Faber 1/75/375. The initials “AWF” in the well confirm that it was made by A W Faber-Castell (ref: Fertigungsplan Kriegswirtschaft von 1944 und Fertigungskennzeichen der Wehrmacht - by Dieter von Jezierski - Paper in RST RS-Brief 6). "AWF" also stands for "Ausschuss fuer wirtschaftliche Fertigung" (~ "Commission for Efficient Production") set up in 1918 , which made slide rules to Dr. Seehase’s patent, but not in this instance.

Fisher Control Valve Sizing Rule Mark VIE made by IWA (05 136) for GEC-Elliott Control Valves Ltd. It is a duplex rule with eighteen specialist scales. Its construction is somewhat unusual as it consists of a sandwich of three layers of plastic, the outer two being transparent with the scales apparently printed on their inner sides.. They are continuous across the rule and the slide runs between them. It is ©1972. It can be used for liquids, gases and steam. It has a cloth backed PVC sleeve. This is a metric rule. An imperial rule by Blundell Harling (Mark VII ©1967) can be seen on the third Blundell Harling page.

Wichmann No 3503 pearwood and celluloid slide rule, made, I think, for the Kriegsmarine, probably by Faber Castell (date code for Sept 1939). Scales are: Ablage in Winkelsekunden, Ablage in m, Wahre in hm, Geratekonstante. There are a table of Geratekonstante on the upper edge and a cm ruler on the lower one. Two worked examples for different calculations are given on the reverse. Was it used with a rangefinder?

Aristo Scholar 0903VS 10” plastic duplex slide rule, with single sided cursor. It is complete with red & cream plastic hard case, and instruction booklet. Scales are: L,K,A{B,C1,C)D,S,ST,T//cm,DF{CF,C}D,in. Code WFL40 dates it to 1967. Made in Austria.

Aristo Scholar 0903LL 10” plastic open frame slide rule, with reversible slide. It is complete with red & cream plastic hard case. Scales are: L,K,A{B,C1,C)D,S,ST,T//cm,(s,LL2,LL3},in. Code WFL15 dates it to 1967. Made in Austria. Upper face has yellowed with age.

Another ten inch mahogany & celluloid, closed frame slide rule. It has a brown leather covered card case and the cursor is aluminium framed. The scales are : cm\A{B,C}D\in//{S,L,T}. It was almost certainly made by Dennert and Pape for John Davis (The D&P name or patent has been milled out, which Davis did, and the case has the three stars used by Davis on their cases). Edwardian period.

This ten inch mahogany and celluloid slide rule was also almost certainly made by Dennert & Pape. It is similar to the one above but the inch and cm rulers are reversed and it has a cm ruler in the well instead of an inch one. Probably a little later than the one above, it is in much better condition. It has a black cloth covered card case.

Aristo Nr. 89 Rietz five inch plastic closed frame slide rule. Scales are cm\K,A{B,C1,C}D,L//{S,ST,T}. There is an inch ruler on the back. It has a leather slip case and dates from 1952.

Aristo No 99 Rietz 10” slide rule. Scales are: in\K,A{B,C1,C}D,L//{S,ST,T}. It has a plastic case and dates from 1968. Its unusual construction is a laminate of white and clear layers of plastic with the inch scale on the protruding central clear layer.

Aristo 911 Simplex 10” closed frame plastic slide rule. Scales are in\A{B,C}D. It has a grey cloth covered card case. It dates from 1961.

Aristo Nr 810 4” pocket slide rule, closed frame plastic. It has a leather slip case and dates from 1957. The scales are: in\A{B,C1,C}D,K//{S,L,T}.

Aristo 915E Elektro 10” plastic slide rule. It has a cloth covered card case and a plastic slip with tables on each side. Scales are:in\K,A{B,B1,C1,C}D,LL2,LL3,D/M,V//{S,ST,L,T}cm. It dates from 1959.

Aristo Simplex 0911 10” open frame plastic slide rule. It has a red & cream plastic case and instruction booklet. Scales are cm\A{B,C}D\in. It dates from 1968.

Nestler Nr. 0130 Multimath Duplex slide rule. A complex 28 scale 5” plastic slide rule with table slip and leather case, purchased ‘new’ from Germany. It has the following scales: LL00,LL01,LL02,LL03,DF{CF,C1F,C1,C}D,LL3,LL2,LL1,LL0//P,S,T1,T2,A{B,K,C1,C}D,R1,R2,L,ST. The R1 and R2 scales are √x and √10x scales for greater precision.

Albert Nestler AG 22R Rietz 6” mahogany & celluloid slide rule, probably dating from the 1920s. It has a black card case. The scales are: cm\K,A{B,C1,C}D,L\cm//{S,ST,T}. The information on the reverse is in German.

Nestler 0123 5” closed frame plastic slide rule. It has a leather slip case. The scales are: cm\K,A{B,C1,C}D,L//{S,ST,T}. It probably dates from the 1950s.

Ten inch mahogany & celluloid, closed frame slide rule, probably made by Nestler for a British supplier as it has a Pickworth data slip on the reverse (possibly an owner addition). Scales are cm\K,A{B,C}D.L//{S,ST,T}\in with an inch scale in the well. It has a black card case. The stator scales have been damaged, shortened and screwed on again at the left hand edge.

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