Triumphs and wonders of the 19th century, a volume of original, historic and descriptive writings showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress (1901)
Boyd, James Penny, 1836-1910 · Philadelphia, A. J. Holman & co · leaf 116
ation. But withthe advent of stronger telescopic power the phenomenon has come to an end. David Bittenhouse, of ISTorristown, whom Thomas Jefferson considered sec- ASTRONOMY DURING THE CENTURY 103 ond to no astronomer living, built an orrery worth a thousand dollars, toillustrate mechanically the… … THREE-INCH TRANSIT, BY WARNER & SWASEY. of toys. Mural circles, much depended upon to measure the declination ofheavenly bodies, have fallen into disuse, supplanted by improved transitinstruments. XVI. PROBLEMS FOR FUTURE STUDY. Many problems are in store for the future. The field for research…
Progress · Inventions
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