Patent Model - Improvement in Slate-Washers
Maker and role
Levi Lyman (b.1828, d.1894), Patentee
Edward Boell (b.1848, d.1924), Patentee
Feb 02 1875
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16 1/4 x 16 1/2 x 2 1/4" (41.3 x 41.9 x 5.7cm)
Lyman and Boell's patent "consists of a water-receptacle convenient for holding with the hand, and having attached to one side of it a sponge. A valve provided with a spring opens inwardly, and permits the water contained in the vessel to drop upon the slate when the valve-stem is pressed by the finger, after which the sponge is applied for cleaning..." (Patent Number 159,274)
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