Patent Model - Improvement in Blackboard-Rubbers

Maker and role
David Jackson, Patentee
Production date
Oct 03 1876
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Object detail

Wood, fabric, metal
3 x 6 x 2 1/2" (7.6 x 15.2 x 6.4cm)
Jackson's patent "relates to certain improvements in that class of blackboard-rubbers for erasing chalk marks thereon, in which an endless strip of carpet or other suitable material is employed in connection with a suitable block and handle, in such a manner that the position of the carpet can be readily changed, so as to present a new rubbing surface as the said carpet or other material becomes worn..." (Patent Number 182,932)
Object number
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