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US Patent: 562,679
Method of Marking Level Glasses or Analogous Articles
Patentees:
Justus A. Traut - New Britain, CT
Christian Bodmer - New Britain, CT

USPTO Classifications:
33/379, 374/210, 65/60.1, 73/323

Tool Categories:
layout tools : levels

Assignees:
None

Manufacturer:
The Stanley Rule & Level Co. - New Britain, CT

Witnesses:
R. A. Moore, Jr.
W. A. Pimm

Patent Dates:
Applied: Jan. 13, 1896
Granted: Jun. 23, 1896

Patent Pictures:
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Description:
Cast iron rotating at a high velocity is used to mark the lines on a level. This method avoided weakening the spirit level at the marking location as the heat soften and fuses the glass and allows the mark to be made while the metal particles color the groove. The text indicates that experiments showed that not all metals worked as well. Companion patent to 562678 which is the patent for the machinery to produce the markings.

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