Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 471
rk focus, was raised to vivid redness. 1 With care it is possible to work securely without this plate of rock-•alt. I never make use of it now.30 146 HEAT A MODE OP MOTION. LECT. XV. Copper-leaf tarnished in a similar manner, whenplaced at the focus, was raised to redness. A piece of platinised…
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