. Kanada's Metals; ein Vortrag auf der Toronto-Sitzung der britischen Vereinigung für die Förderung der Wissenschaft, 20. August 1897 gehalten . die Flexibilität von Nickel-Stahl für defensivepurposes kann aus einer leicht zugänglich Quelle zitiert werden, die Naval and Military Intelligence oftthe Times oi 21. Juli des vergangenen Jahres (1897). Itstates, dass es eine erfolgreichste Studie von a4-Zoll-speziellen Nickel-Stahl-Panzerplatte an Bord derNettle gestern, unter der Leitung von Marine-Officersin Portsmouth. Die Platte war 4 Fuß quadratisch, 4 inch dick, und hatte keine Holzrückseite dahinter. Es wurde von einer 5-Zoll-Kanone getackt

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. Canada's metals; a lecture delivered at the Toronto meeting of the British association for the advancement of science, August 20, 1897 . ility of nickel steel for defensivepurposes may be quoted from a readily accessiblesource, the Naval and Military Intelligence ofthe Times oi July 21st of the past year (1897). Itstates that there was a most successful trial of a4-inch special nickel steel armour plate on board theNettle yesterday, under the direction of naval officersat Portsmouth. The plate was 4 feet square, 4 inchesthick, and had no wood backing behind. It was at-tacked by a 5-inch gun with Palliser projectiles. Thefirst shot was fired with a velocity of 1, 406 feet persecond, but the plate showed no sign of having beenhit. The 5olb. projectile simply splashed on the face.The second shot was fired with a velocity of i, 750 feetper second, the plate being indented about three-quarters of an inch, but the face was not in any waybroken. The third shot also had a velocity of1, 750 feet, but the indentation was only half an inch. ^ Paper by W, Beardmore, Inst, of Naval Archietcts, Engi-neering, April 30, 1897, p. 589. ^^. 7^/V. II.—Section through anodule of metallic nickel showing concentric layers of nickel, A. releasedfrom ils compound with carbonic oxide and deposited on a nucleus of ordinary nickel, B.The nodule was J inch in length. The magnification is 140 diameters. To face page 38. CANADAS METALS 39 There were no cracks of any kind in the plate, butthe projectiles were in every case broken to finepieces. Great satisfaction was expressed with thisresult, as the plate will prove invaluable where thin, unbacked armour is desired. There is another curious point connected with therelations of iron and nickel. Iron alloyed with2 5 per cent, of nickel has its density permanentlyreduced by an exposure to a temperature of — 30° C, that is, the metal expands at this low temperature.Supposing, therefore, that a ship of war were builtin an ordinary climate of ordina

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• bookcentury1800
• bookdecade1890
• booksubjectmetals
• booksubjectmi