Confocal conic stencil

Confocal conic stencil, in transparent celluloid

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Confocal conic stencil, in transparent celluloid
Science Museum Group
© The Board of Trustees of the Science Museum

Confocal conic stencil, in transparent celluloid, Dufton's patent no. 5753/1910

Details

Category:
Mathematics
Object Number:
1911-274
type:
stencil
credit:
MacMillan and Co.