File:The Science record; a compendium of scientific progress and discovery (1874) (14782288275).jpg

Identifier: sciencerecordcom1874beac (find matches)
Title: The Science record; a compendium of scientific progress and discovery
Year: 1872 (1870s)
Authors: Beach, Alfred Ely, 1826-1896
Subjects: Technology Industrial arts
Publisher: New York, Munn
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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ivered to atoms. No further damage was done,however, for the conductor on the topmast below the sparimmediately carried off the terrible flash. No further ex-amples are needed to prove that a lightning-rod construct-ed according to the principles set forth is a protector tolife and property. 83 THE END OF THE UNIVERSE. It is supposed that the resistance of the ethereal medi-um, shown to exist by the undulatory theory of light, willgradually cause the satellites to fall into the planets, theplanets into suns, and suns into a common centre, afterwhich darkness, silence, and death will reign. The experiments of Dr. Steintz show, that when elec-tricity is sent through soft steel, copper, brass, or platinumwires, an elongation thereof takes place equal to aboutone fifth of the elongation produced by heating the wires. The pressure produced by gunpowder upon a cannon-ball is estimated by Papillon at 75,000 lbs. per square inch. The temperature of ignited gunpowder is estimated tobe 25oo°F.
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(252) JOSEPH NORMAN LOCKYER. (SEE BIOGRAPHY.) MECHANICS AND ii«I^!ERING. 253 MECHANICS AND ^6t^^RIN%,/ COMPLETION OF THE GREAT BRIDGE ACROSSTHE NIAGARA RIVER. The great international bridge across Niagara Riverfrom Buffalo to Fort Erie, in Canada, has been lately com-pleted. The Buffalo Commercial Advertiser furnishes thefollowing interesting description : To state the facts roughly but plainly, the entire lengthof the bridge is about three quarters of a mile. But morein detail the length is as follows : In the main river, 1800feet; over Squaw Island, 1300 feet, (trestle-work,) and overBlack Rock Harbor, 450 feet. The entire length of thesuperstructure in the main river is 1890 feet; in BlackRock Harbor, 440 feet. There are nine spans in the por-tion on the main river and three in the Black Rock Har-bor : four of 190 feet in the clear, and three of 240 in theclear. Over the main river also are two draw-openings,of 160 feet each ; total length of draw-girder, 362 feet. InBlack Rock Ha

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