Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 38
p of beech, mulberry, or some other wood,into a hollow formed in a slab of oak or mahogany, andcausing the pin to rotate rapidly,.in a few seconds denseand stifling fumes rise from the place of friction. Boththe rotating pin and the hollow in which it revolves arecharred; and so rapid is this… … produce it. But brushing with a feather a small quantityof fulminating powder against the rotating pin, it mixeswith the charcoal powder and gently ignites, the woodcontinuing to blaze afterwards as long as the rotationcontinues. MECHANICAL HEATING AND CHILLING OF AIK. FOBMATIONOF CLOUDS. One of…
Heat
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