Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 157
d, withor without automatic signal equipment; and in the case of the Vol. 194, No. 1160—11 142 !Frank J. Sprague. [J. F. I. former, regardless of whether AC or DC normal danger ornormal clear signals are used, with or without interlocksand overlaps. Be suitable for any road, regardless of the kind… … Reset track magnet. track equipment; or be limited by extraneous equipment alongthe right-of-way; or interfere or be interfered with by snowplows or dragging equipment. Be unaffected by climatic extremes, proof against inter-ruption by water, snow or sleet, and subject to a minimumof depreciation.…
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