VL: Laboratory [enc13]

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In fact, almost all of the mentioned firms were chronoscope dealers, not manufacturers. Krille bought his chronoscopes from the Hipp factory in Neuchâtel; Spindler & Hoyer made no chronoscopes but only special parts for them; Max Kohl signed the chronoscopes he offered, but the serial numbers on the clockworks reveal that he had purchased them at Neuchâtel. Besides Hipp and Peyer & Favarger, there were probably only three firms which produced their own chronoscopes: F. L. Löbner in Berlin, Strasser & Rohde in Glashütte, and E. Zimmermann in Leipzig. Taking the example of chronoscopes made by Zimmermann, in which some significant differences from the Hipp chronoscopes from Neuchâtel can be detected:

Differences between Hipp and Zimmermann chronoscope

Adjustment:	the weight is a cylinder; Hipp used a cubic weight. (1)
Signature:	all instruments are signed Zimmermann. (2)
Movement:	Zimmermann used lots of different designs for the plates; plates were connected with screws and washers; Hipp used screws only (3); sometimes the plates have a special grinding; Hipp used polished plates only (4); often the gear wheels are punched; Hipp used gear wheels with legs only (5).
Serial No.:	Zimmermann = 2-3 digits, Hipp = 4-6 digits.

Reference: Schraven, Thomas. 2004. The Hipp Chronoscope.. The Virtual Laboratory (ISSN 1866-4784), https://vlp.mpiwg-berlin.mpg.de/references?id=enc13&page=p0008

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