A brass air meter by J H Steward, 406 The Strand, London, with silvered dial and subsidiary dials for fractions of feet, in a fitted box, plus a 7" brass lens with rack and pinion focusing, from "The Praestantia" magic lantern projector (2)
A brass air meter by J H Steward, 406 The Strand, London, with silvered dial and subsidiary dials for fractions of feet, in a fitted box, plus a 7" brass lens with rack and pinion focusing, from "The Praestantia" magic lantern projector (2)
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
