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XC Patent: XC-249
New process for tempering and hardening the teeth of saws used for milling and other purposes
Nathan Wharton - Johnstown, QC Canada

USPTO Classifications:

Tool Categories:
tool making : making sawblades


Not known to have been produced


Patent Dates:
Granted: Aug. 01, 1848

Patent Pictures:
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The patent image and description (below) was found in the 1860 book, "Patents of Canada, from 1824 to 1849", published by the Canada East's Bureau of Agriculture and Statistics.

"A sheet iron box, seven feet in length, twelve inches in depth, and six inches in width, to contain charcoal, is made with an opening at the bottom to contain air. A plate, or shelf of iron, seven inches wide, projects horizontally from the box whereupon to lay the saw, having an opening to admit the teeth to be heated. On the top of the iron box is a range of funnels, or chimneys, having an air valve, or damper, in each to regulate the heat; there is also a water trough the length of the saw, having an iron bolt across within both ends, to be filled with water, oil, or other fluid, to the proper height required to temper the points of the teeth, but not to harden those parts to be bent by the saw set. After hardening the points the temper will require to be drawn to brought out by the application of a hot iron bar, or ignited oil, together with a wet sponge until they will admit the action of a file."

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