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 55
the two push buttonsis being operated unless an annuncia-tor OT similar device is nsed. A verysimple annunciator for indicating two numbers can be made from a small box. Fig. 1. with an electric bell magnet,A. fastened in the bottom. The arma-ture, p,. is pivoted in the center by means of a small… … Annunciator and Wiring Diagram 1. while the closing of the push buttonB will ring the bell and move thepointer to 2.—Contributed by H. S.Bott, 109 Cooper St., Beverly, N. J. Experiments are being made withbrown sugar which is said to greatlyincrease the adhesive properties ofmortar. Equal parts of…
Handicraft · Amusements
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![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-96-37.webp)
