Rare 1890's Thatcher Cylindrical Slide Rule

Item Details

K & E / Keuffel & Esser # 4012 Type I Thacher Slide Rule / Calculator This Type I Keuffel & Esser / Thacher calculator / slide rule is the earliest and finest condition Thatcher calculator I have ever had the pleasure to offer. The serial # is 5318. That was K & E’s catalog designation for this rule after 1890 and I would assume means this dates from within a year or so of that date. Edwin Thacher first patented the idea for this slide rule / calculator in 1881 in England. The Thacher calculator has a near unique sliding drum design whose scales total over 30’ long. if laid out in a line. The idea was an immediate success with the scientific and engineering communities. K & E bought the rights to produce them, and initially Stanley of England produced them in England before K & E moved production to the states near the turn of the century. The overall condition of the rule is exceptional. There is virtually no spotting or yellowing. The inner scales on the drum are very nice as well with no damage or lifting of the paper scales. The label with serial # and model number inside is near perfect. Also included is the original instruction booklet.

Condition

Very good for its age. Booklet cover is loose from the pages.

Dimensions

Item #

13CIN004-476