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 81
;*- -4 —-3K -i*-? r3^ sj% h <o M A*T *5 V\£ ? \7 ♦j/ *f 2 L^y **t. ,J?T? -35- - 4- - 5 <VV7 -*- hi 67 >crew/ r Tracer jPoint \0 Rsncil left and No. 6 on the right are matchedthen the increase will be 6 times. Thedistance the holes are made one fromthe other is shown with the figures… … Home-Mad* Pantograph Interrupter for Induction Coil high resistance contact, whenever thereis any connection made at all. Thistrouble may be done away with by de-parting from the old single contactvibrator and using one with self-clean-ing contacts as shown. An old bellmagnet is rewound full of No.…
Handicraft · Amusements
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