Mechanics for young America; how to build boats, water motors, wind mills, searchlight, electric burglar alarm, ice boat ..etc.; the directions are plain and completeReprinted from Popular mechanics . Fig. 2 box form with half-dark slides focused atinfinity is most convenient. For attachingit to the balloon hoop use screw-clampedtrunnions at its sides, mounted in triangu-lar side frames, so that it can be set at anyangle desired. This is clearly shown inFig. 1. Fit to the lens of the camera aBausch and Lomb shutter, as shown in , arranging a hook to hold it until it istime to remove the h
Mechanics for young America; how to build boats, water motors, wind mills, searchlight, electric burglar alarm, ice boat ..etc.; the directions are plain and completeReprinted from Popular mechanics . Fig. 2 box form with half-dark slides focused atinfinity is most convenient. For attachingit to the balloon hoop use screw-clampedtrunnions at its sides, mounted in triangu-lar side frames, so that it can be set at anyangle desired. This is clearly shown inFig. 1. Fit to the lens of the camera aBausch and Lomb shutter, as shown in , arranging a hook to hold it until it istime to remove the hook and release theshutter, this operation being performed byan electromagnet connected with a battery,which arrangement will be described fur-ther. The length of the captive line may photographs may be taken at anelevation of 150 feet and good ones at 500feet. We would recommend the use of along line, as there is a pleasure in experi-menting with altitudes and comparing effectsand results. The captive line should be POPULAR MECHANICS. 61. Fig. 3. Broomwater Creek, England, Photographed at an Elevation of 1GO Feet. both light and strong and wound into a sin-gle cable with a double-strand flexible in-sulated conductor, such as is used in mak-ing telephone connections. In Fig. 5 is shown a reel for winding andunwinding this three-strand cable. Thereel runs on ball bearings and the innerends of the two wires are connected with aplug terminal on the reel, so that a terminalbattery may be connected at the momentthe electric current is desired. The relation
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Keywords: ., bookcentury1900, bookdecade1900, bookp, booksubjectindustrialarts
