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Guest Post By: Richard Thomas Figure 1: s/n 2541201 Beginning in 1911 and continuing through 1914, the Illinois Watch Co. introduced their new 16s, Model 9, Nickel Bridge movement. Year IntroducedFirst Serial No.GradeJewelsAdjusted1911233703171023T, I, 6 Positions1913252600170517T1913252640170619T, I, 3Positions19132541331Sangamo Special21T, I, 6 PositionsT = Temperature; I...
Pictured: Measurement on a Standard Regulator Screw from 16-Size Illinois Model 4 (5.25mm) The patent application submitted by Arthur Bonnet in March 1910 for his automatic temperature compensating screw indicates the effectiveness relies on using softer steel with less carbon content. In 1910, Bonnet’s design...
Pictured: “Temperature Compensating Mechanism” Patent #968235 In 1910, the Lincoln Watch & Jewelry Company secured a patent for an improvement to the regulator used on its watches, designed to provide additional temperature compensation. The patent was issued to Arthur Bonnet on August 23, 1910, and...
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