. Bird-lore . igger of the trap, the picture would represent a bird in motion with wings flap- (194) A New Device for Securing Birds Pictures 195 ping or folding almost in the face of the camera, and it was thereforefound necessary to devise some means by which the exposure could bedeferred until the bird was in repose. The result is shown in the accom-panying figures. When the bird alights upon the perch «, the checkresting on the wheel b is removed and as the wheel revolves the heav-ier of two weights c, sliding on rods, descends and enters d and e, thenegative and positive poles of a dry ba
. Bird-lore . igger of the trap, the picture would represent a bird in motion with wings flap- (194) A New Device for Securing Birds Pictures 195 ping or folding almost in the face of the camera, and it was thereforefound necessary to devise some means by which the exposure could bedeferred until the bird was in repose. The result is shown in the accom-panying figures. When the bird alights upon the perch «, the checkresting on the wheel b is removed and as the wheel revolves the heav-ier of two weights c, sliding on rods, descends and enters d and e, thenegative and positive poles of a dry battery. The circuit is thus closedand by means of a small electro-magnet on the camera the shutter isreleased and exposure made. How the bird is to be induced to alight on the perch is a problem whicheach user of this modern development of a bird trap must solve for himself. The accompanying pictures of Bluebirds were obtained by placing theperch near their nest; the camera was then focused on it and the whole. BLUEBIRD ON ELECTRIC PERCH afifair left until, on returning, the shutter was found to have been sprung,when the exposed plate—representing, potentially, the trapped bird—wasremoved, a new one introduced and the trap set for another capture. No other trial has as yet been made, but in addition to its use nearnests, the apparatus couKl doubtless be employed with success in largefields or meadows frequented by Hawks, or, carrying the comparison with atrap still further, it might be baited with meat, seeds, or fruit which wouldinduce birds to alight on the perch .and unronsciousK- K-ave their image. Bird-Life in the Klondike BY TAPPAN ADNEY Author of The Klondike Stampede, etc. IT is less from the point of view of the naturalist than of the minerthat I know the birds of Klondike—we were all miners, in asense, who went to Klondike in the midst of that unparalleled ex-:itement. So strenuous were the exertions required to keep body andsoul together that there was small ti
Size: 1745px × 1431px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1800, bookdecade1890, booksubjectbirdsperiodicals
