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The common rules were produced in regular batches but the specialty rules did not sell as well and a given batch of rules might stretch over several years. It is not uncommon to find rules in the s in 68 xxxx series packaging but series model numbers on the rules. 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 a given rule was to facilitate manufacturing allowing the mating of pieces of rules in final assembly. The slides 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 to , mating of the rule parts was through the use of numbers stamped into the end of the rules on both the frame and the slide. These numbers were probably 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. 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 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. Copyright dates in instruction manuals suffer from the same problem as patent dates. Very often it is necessary to do a page for page comparison of two manuals with different copyright dates to find out if there is a difference.
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