| 摘要 |
1,211,976. Battery lamps. K. SASSMANNSHAUSEN. 21 April, 1969 [22 April, 1968], No. 20304/69. Heading F4R. [Also in Division H1] In an electric battery lamp having at least two series-connected battery cells and a bulb, wherein the bulb is matched to the battery cells to give maximum light output, the resistance of the bulb measured in ohms is equal to the sum of 19 to 21 times the reciprocal of the positive numerical values of the square roots of the effective surface areas of the negative electrodes of the cells in square centimetres, the weight of the filament being between 1À9 and 2À5 Ágms. per square centimetre of the sum of the effective surface areas of the cells. |
