Electrical measuring instruments : grand prize Louisiana Purchase Exposition, St. Louis, 1904 (1904)
Leeds and Northrup Company · leaf 31
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. … f ) 1 ) 5290. Charge and Discharge Key $17 50 This key is admirably adapted to charging and discharging conden-sers of small or large capacity. The insulation is very high, so that noelectricity can be lost by leakage. The insulated handle enables the keyto be used without insulating the bodv…
