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ts. Tycho Brahe, about the same period, made material improvements on the landgrave's instruments, and constructed a quadrant capable of showing single minutes. He afterwards erected an observatory on the island of Huen, under the patronage of the king of Denmark; it was furnished with quadrants, sextants, circles, astrolabes, globes, clocks, and sun — dials. These instruments were divided to single minutes, and some were so divided as to read to ten seconds. The royal observatory at Paris was completed in 1671, and was placed in charge of M. Cassini, after having been furnished with instruments at a very great expense. The Greenwich Observatory was erected five years later; Flamstead, under the title of Astronomer Royal, was its first superintendent. The Yale College Observatory was started in 1828, a donation made by Mr. Clark being expended in buying a telescope of Mr. Dollond of London. It has a focal length of ten feet, and five inches aperture. The Williams Col
to produce an opposite electrical state in surrounding bodies. In-duc′tion-coil. A compound coil by which voltaic or dynamic electricity is converted into static electricity or electricity of high tension. The discoveries of Faraday, Henry, Bequerel, and others led the way to the invention of the induction-coil, and it is believed that the first practically useful device of the kind was contrived by the late Dr. Charles G. Page of Washington. Induction-apparatus. Ruhmkorff, of Paris, having made many instruments of the kind and contrived various improvements, the instrument is now very generally called by his name. It consists essentially of an inner coil of coarse wire surrounding a core of soft iron rods, and connected with the poles of a voltaic battery. It is itself surrounded by, though insulated from, a coil of copper wire composed of a great number of convolutions, and connected with the discharging conductor. By opening and closing the circuit with great r
ilian3.155 Flint2.586-2.664 Garnet, common3.576-3.688 Garnet, precious4.000-4.352 Granite2.613-2.956 Gypsum1.872-3.310 Gypsum, ordinary, about2.3 Hornblende, common3.600-3.830 Hyacinth4.000-4.620 Jade2.959-3.389 Jasper2.566-2.816 Jet1.259-1.300 Limestone2.700-2.837 Limestone, green3.182 Marl1.700-2.944 Malachite3.572-3.994 Marble2.516-2.858 Mica2.546-2.934 Millstone2.484 Mortar1.384-1.750 Mud, about1.630 Opal1.958-2.144 Peat0.600-1.329 Pitchstone1.970-2.720 Plaster of Paris1.176 Plumbago1.987-2.267 Porphyry2.670-2.790 Pumice-stone0.915 Quartz2.64-2.66 Rock crystal2.605-2.888 Ruby, Oriental4.283 Ruby, Brazilian3.531 Sand1.392-1.800 Sandstone2.08-2.52 Sapphire3.991-4.283 Sardonyx2.594-2.628 Serpentine2.429-2.999 Shale2.600 Slate2.672-2.955 Spar, calc.2.715 Spar, feld2.693-2.704 Spar, fluor3.138-3.183 Spar, other varieties2.43-3.873 Steatite2.61 Stone, building varieties1.386-2.945 Stone, building, common2.520 Stone, building, Bath, England1.