Easy electrical experiments and how to make them; (1918)
Dickinson, Leonard Perley, 1874- [from old catalog] · Chicago, F. J. Drake & co · leaf 160
d with a shoulder as shown, and a hole is drilledthrough the spring to receive the smaller part of the ferrule.The latter and the spring are then soldered together. Thecarbon rod C should be about 3-16 inch in diameter, andshould fit the hole in ferrule snugly. A screw passingthrough the side of… … -r- □ <h -* Sir F.&. 3 to be looking in direction that commutator is to revolve.The springs should be about 3% inches long, 1-32 inch thick,and % inch wide. In Fig. 2 the upper holder is shown insection, and the lower holder in elevation. Each springmust be carefully insulated from the brass…
Electric apparatus and appliances · Electricity
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