s cor- • » ■ 1 * ■ strument with which exceedingly small quantities of Official meteorological Summary, New York, N. If., responding to the width of the slot. heat can be measured. January, 1909. A 5x7 camera of the type just described, with a The essential part of the new Fery photometer is a… … The Aero Club of America has just announced the hood protruding and may be easily turned toward Measuring the candle-power of a lamp with the offering of a cash prize of $10,000 by the New York any point on the horizon or even tilted so as to be Fery photometer. World for a flight by an aeroplane…
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