Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 81
et in thickness, the bed of fire-clay below it sevenfeet in thickness, and still beneath this, a bed of bituminous coalfour feet thick, which will make a drift in the mine of fifteen feet.The quality of the fire-clay is very superior, equal to that of thePittsburg region; while the coal is… … Sunlight and MoonlighL 59 DUCATIONAL I SUNLIGHT AND MOONLIGHT, A Lecture delivered at the Academy of Music, before the Franklin Institute, onMay 23d and June 6th, 1868, By Prof. Hexry Morton, Ph.D (Note.)—The following report of this lecture has been prepared at tlie reqnestof members of the…
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