Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise on the care and management of steam engines, boilers and electric machinery (1922)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1483
rips of leadimmersed in dilute sulphuric acid. When current is sent 1448 Steam Engineering through them one plate turns a dark brown color, xnd th^other a grey color. After an hours passage of currentreverse the connection and charge the other way. Theplates will change color—the grey one becoming… … begins to gas or boil. This is the signal to reverse the cur-rent as the cell is charged. When the cell takes several hours to gas it is in condi-tion to use. After one of the reversals continue to charge until cellhas gassed about fifteen minutes. Eemove the chargingwires and connect to anything…
