Amateur mechanics ... a book for old and young who like to make things .. (1907)
Popular mechanics magazine, Chicago. [from old catalog] · Chicago, Popular mechanics · leaf 13
e of fire is shown in theaccompanying diagram. A is a woodenblock, which is fastened under the loft ata gable end of the barn; B is an iron weightattached to the string, C, and this stringpasses up through the barn to the roof, thenover a hook or pulley and across the barn,under the gable, and is… … E, and the strip of spring brass, F, in placeagainst the wooden block. G is a leatherstrap, fastened to the weight. B, and thespring, F. connected to the latter by a smallsink bolt. At the house an eleotric bell la placedwherever convenient. Several battery cells,of course, are also needed. Dry…
Handicraft · Amusements
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
