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Dating slide rules
There were also Up Products catalogs that situated slide rules. Those numbers were probably used for each suite of production and do not seem to have any other independence. The Work and Thacher's slide rules had their own spread number contents. Its figure is somewhat guest as it consists of a computer of three news of plastic, the outer two being go with the views apparently printed on their ship sides. It has the municipality scales:.
The Fuller and Thacher's slide rules had their own serial number systems. On early rules the serial numbers were usually on the rule in two places, the end of the slide and the bottom edge of the frame. The presence of two serial numbers on Daging given rule was to facilitate Dating slide rules allowing the mating Dating slide rules s,ide of rules in final assembly. The slied and frame were cut from the same piece of stock and for best stability over the life of the rule they should be mated together in final assembly. From the s on the serial number is on the slide and the last three digits of the number is repeated on the frame pieces to facilitate this mating.
Prior tomating of the rulew parts was through the use of numbers stamped into the end of the rules on both the frame and the slide. These numbers were gules used for each batch of production and do not seem to have any other significance. It appears that yearly slide rule only catalogs were produced but at this time only a few of these are available. There were also Educational Products catalogs that contained slide rules. Following a given model from catalog to catalog is very instructive in tracing the evolution of the model.
A date range for a given model can be established doing this. Many of the major variations of a given model can be observed and thereby putting a date range on that variant. Care must be taken in assuming that a particular model was carried between any two full line catalogs. There are cases of entire models coming and going between full line catalog issues. There are slide rule model numbers that never appeared in any catalogs. There are mistakes in the catalogs both in descriptions and illustrations. Many of these are subtle and usually do not make much difference. In the s and s some of the illustrations show serial numbers on the rules. Some people think these numbers have significance.
If they do it probably is limited to being that it might have been a real serial number at the time the illustration was drawn. Many of these illustrations were used over and over in many catalogs and obviously the serial numbers did change in that time frame. When they changed, all production of all models was switched over. There is a definite timeline to the cursor models. Before Slide rules either had no cursor, a brass chisel type cursor, or a metal framed glass cursor. The first issue had metal end blocks. The presence of a given cursor on on a rule can sometimes be misleading.
Replacement cursors were sold for all previous models. Patent and Copyright Dates: Patent and copyright dates are often quoted by sellers of slide rules implying that the rule is that old. The date of a patent only means that the rule was not produced before that date. It is very common to see s for sale quoting the patent date. The first production of the was in The patent date shows up on all s until the beginning s. The patent was for generic construction techniques used on all Mannheim type rules.
Dating slide rules Copyright Dting in instruction manuals suffer alide the same problem as patent dates. Very often it is necessary to do a page for page comparison of two manuals Dating slide rules different copyright dates to find out if there is a difference. Manuals before are poorly organized and often contain sldie for several types of rules. On a given rule you will find that scale sets, model numbers, construction methods, printing styles, packaging, and logos evolved. A particular family of rules such as the gained members and lost some over its life span. Complete with gray cloth covered card case.
Aristo Nr Scholar open frame simplex plastic slide rule dating from 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. Reiss Progress duplex aluminium ten inch slide rule. It has a vinyl case. Gray cloth covered card case.
Almost certainly made by Faber Castell. It has their date code for Slixe in the Dating slide rules places, the construction is the same, Dating slide rules are the dimensions, the type face, the cursor construction and the card case. It sslide 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 can be used for liquids, gases and steam. It has a cloth backed PVC sleeve. This is a metric rule. Wichmann No pearwood and celluloid slide rule, made, I think, for the Kriegsmarine, probably by Faber Castell date code for Sept 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? Code WFL40 dates it to Code WFL15 dates it to Upper face has yellowed with age.