Electrical measuring instruments : grand prize Louisiana Purchase Exposition, St. Louis, 1904 (1904)
Leeds and Northrup Company · leaf 30
depressed, thegalvanometer is short circuited, and its oscillations are quickly dampedout by the currents induced in its coil The back end of the spring isheld in a slot in a rubber block, and this is held in a slot milled in thebase. By this construction the perfect matching of the contacts is… … 5110. Double Contact Key $10 5o It will be noted that tlie same method for holding the springs is used 30 THE LEEDS & XORTHRLP COMPANY in the design of this key as in the short circuiting key. the method beingextended to the base and three bh^cks.
