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US Patent: 1,039,055
Nicholas Helwig - Middletown, OH

USPTO Classifications:
33/42, 33/486, 409/218

Tool Categories:
layout tools : marking gauges : wheeled marking gauges


Not known to have been produced

L. C. Heffner
B. C. Langdon
G. d. Kesler
M. A. Schmidt

Patent Dates:
Applied: Mar. 13, 1912
Granted: Sep. 17, 1912

Patent Pictures:
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This is a machinist's scratch gage based on a design commonly used by micrometers. The gage bar is threaded, and the head runs on this thread. The head is marked with divisions such that it is possible to position the fence within a couple of thousandths on an inch by turning the head.

Particularly interesting on this piece is how it shows the inch graduations. The threaded bar has a square notch milled down its length, not only providing a flat surface for marking the graduations, but also a reference edge for the markings on the head.

This is a very clever design, and would have been simple and cheap to produce.

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