Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 116
and in like manner falls suddenly, break-ing connection at the four points. The air is admitted andreleased from T by the device TN, which is operated by thesame air pressure each minute which operates the four dialmovements. The index shown partially in black, partiallyin white is for twenty-four… … Fig. 17.—Electric air compressors. twenty-four hours; in other words, the 600 lights are thrownin in the evening and out in the morning automatically. Inthe same case with this device is the city schedule for streetlighting and the clock lights according to the city schedule.On the same marble slab…
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