Patent Model - Improvement in Furnaces for Roasting Ores

Maker and role
David O'Harra, Patentee
J. Ferguson, Assignee
Peterson & Olsson, Maker
Production date
Sep 10 1878
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Object detail

Metal, paint
10 x 12 x 5 1/2" (25.4 x 30.5 x 14cm)
O'Harra assigned one-half his rights to J. F. Ferguson.

"My invention relates to that class of horizontal furnaces intended for desulphurizing and chloridizing ore, and introduces certain improvements in the furnace for which Letters Patent were granted to myself and Clark B. Thompson on the 6th day of August, 1867, and of which I am now sole owner." (Patent Number 207,890)
Object number
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