Patent Model - Improvement in Hot-Air Chambers

Maker and role
Jane Swisshelm (b.1815, d.1884), Patentee
Production date
Jun 13 1876
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Object detail

Tinned sheet iron
2 x 4 5/8 x 4 5/8" (5.1 x 11.7 x 11.7cm)
Swisshelm's patented improvement "consists in interposing between a cold-air chamber or the flue and the hot-air chamber partitions of thin plates of wrought metal, perforated by a sharp instrument, so as to have a 'burr' or sharp rough edge around each perforation on one side, while on the other each one is a smooth-sided funnel-shaped flue..." (Patent Number 178,813)
Object number
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