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 . Tig. 1 the gas is entered is commonly left purpose in this is that on ascending,as the pressure of the external air dimin- ishes, the expansive force of the gas con-fined in the balloon greatly increases. Forour purpose the balloon will not ascend toany great altitude, but were an ascent ofseveral miles to be made, the expansiveforce of the gas would soon tear the silkenvelope into shred
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 . Tig. 1 the gas is entered is commonly left purpose in this is that on ascending,as the pressure of the external air dimin- ishes, the expansive force of the gas con-fined in the balloon greatly increases. Forour purpose the balloon will not ascend toany great altitude, but were an ascent ofseveral miles to be made, the expansiveforce of the gas would soon tear the silkenvelope into shreds if there were not somemeans for a small amount of the gas toescape. Over the silk envelope place a networkof light, strong cords hanging down to thelower half of the envelope, and havingcords or leading lines attached for fasten-ing it to a hoop. A balloon of 500 cubic-feet capacity can be inflated in about twohours. For taking the photographs a camera of
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Keywords: ., bookcentury1900, bookdecade1900, bookp, booksubjectindustrialarts
