Addyman, Frank Thornton · London : Scott, Greenwood & co. · leaf 86
wires,one connected with each pole. The sodium sulphate will bedecomposed with separation of sulphuric acid at the positivepole. The acid at once turns the litmus red, whilst the alkalideveloped at the other pole has no effect on the blue colour. As to the regulation of the current. Where a… … Fig. 18.—-Lamp Resistance. switched on. Next the rheostats are turned so as to graduallylower the resistance until the requisite current in amperes isregistered on the ammeter. If this current has not been statedby the maker, a safe rule is to divide the capacity in ampere-hours by 10, and to allow…
X-rays
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