ed by rapid changes of temperature, inches and a half in diameter. The light requires 40 horse producing corresponding changes of shape and volume in power to maintain it. the bodies impinged upon by the beam. But if this be the case, and if gases and vapors really absorb radiant heat, ELECTRICAL… … ruptions of the thermal rays.* Among gases tried, nitrous oxide and illuminating gas ELECTRICAL FIRE INDICATOR. yielded the loudest sounds. Among vapors, water and sul- phuric ether were most susceptible to the intermittent rays. vised and constructed, but the one represented intheengrav- A candle…
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