Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 105
sting occurence, and the yield oftinis almost twice as much as the usual working ores of the tin minesof Cornwall, England. The property is said to consist of fiftythousand acres of mining lands, and over twenty openings have been 88 Editorial. effected, from all of whicli the ore is extracted. The… … APPROXIMATE GRAPHIC METHOD OF SQUARING THE CIRCLE. Philadelphia^ January 6, 1869.Prof. Morton.—Dear Sir:—The following geometrical construc-tion, though very simple and beautiful, may be new to your readersas it is to me. I owe it to the kindness of a Scotch professor.It enables us, 1st, to…
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