| 摘要 |
<p>761,634. Supply systems depending on two sources. LAURENCE, R. F. May 5, 1955 [Oct. 25, 1954], No. 30726/54. Class 38 (4). In order to enable a photometer comparison filament lamp 10 to be fed with a constant current from a battery 11, the battery 11 which has a small internal resistance is charged by a battery 12 and a resistor 13 having a resistance greater than that of the battery 11 is inserted in the circuit.</p> |
