Much experience with the kite-collector has convinced Mr. Eddy that there is always in the air overhead, at all times of the year and in all weathers, an abundant, practically a boundless, supply of electricity. It has never yet happened to him to send his collector up to even so low a height as four hundred feet without getting a spark in his discharge-box at the earth. He has discovered, however, that the greater the amount of moisture in the air, the greater is the height to which he must send the collector before getting the first spark. There is no doubt that large quantities of electricity might be obtained by hoisting large collectors, supported by strong flying tandems, to considerable altitudes, and drawing off the supply at the earth by means of a system of transformers which would lower the electricity from the dangerously high tension at which it discharges down the wire, to a voltage that could be handled with safety. In his experiments thus far, Mr. Eddy has discharged the copper wire leading from his collector into a wooden box containing a pasteboard wheel with darning-needle axle and tinfoil edges. The axle is grounded, and the copper wire from the collector placed near the tinfoil periphery of the wheel, so as to discharge its sparks through the intervening distance, and by the shock cause the wheel to turn. THE USE OF KITES IN PHOTOGRAPHY. One of the most interesting applications of the kite, but a thoroughly practical one, is its use in photography. This has been entirely developed within the past year or two; indeed the first kite-photograph taken on the American continent was one made by Mr. Eddy's camera on May 30, 1895. Although some attempts in this direction had been previously made in Europe, this was the first clearly focused kite-photograph obtained. The previous ones had been blurred, owing to defects in the devices for swinging the camera apparatus from the kite-cord, and for loosening the shutter. Mr. Eddy's apparatus will be better understood from the accompanying cut than from any description. In a general way it is a wooden frame capable of holding the camera, and terminating behind in a long stick or boom, by means of which the camera is made to point in any desired direction or at any angle. This is arranged before sending up the apparatus, the boom being properly placed and held in position by means of guy cords from the main kite-line. A separate line hangs from the spring of the camera shutter, with which is also connected a hollow ball of polished metal supported in such a way that it will drop from its position, five or six feet through the air, when the camera cord is pulled. The purpose of this ball is to allow the operator on the ground to be sure that the camera has responded to his pull and that the desired photograph has been taken. He is assured of this, having given the pull, on seeing the flash made by the polished ball in its fall.