Identifier: historyofmanufac00amer (find matches)
Title: History of the manufacture of armor plate for the United States navy
Year: 1899 (1890s)
Authors: American Iron and Steel Association, comp
Subjects: United States. Navy Armor-plate
Publisher: Philadelphia, American Iron and Steel Association
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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city. Calibre of Gun. Thickness of Plate. Harveyized Armor. Krupp Armor. 4 inch 4 inch 1,676 f. s. 1,818 f. s. 5 inch 5 inch 1,717 f. s. 2,045 f. s. 6 inch 6 inch 1,659 f. s. 1,885 f. s. 8 LQCh 8 inch 1,558 f. s. 1,772 f. s. 10 inch 10 inch 1,502 f. s. 1,765 f. s. 12 inch 12 inch 1,469 f. s. 1,661 f. s. In another official communication upon this subjectAdmiral ONeil said : The advantages to be derived from the use of Krupp armor are ob-vious and need not be enlai^ed upon, it being sufficient to state that atwelve-inch plate of the new process armor would be equivalent to afifteen-inch plate of the quality now being used, thus affording equalprotection on 25 per cent, less weight, or 25 per cent, greater protec-tion with present weights. As only a limited weight can be assigned for armor for hull and gun in Ks* 3 O c 2 » IT. a £. W w S £^ w a. E :? ^ W iL B* i> :T -^ & »j. o w S Zl pit I n wX I—I^ s > 17^ C il ^ & fQ O ;> re a. o =r >rr 00 I—I n r> m o 3
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ARMOR PLATE FOR THE NAVY. 26 protection (23 per cent, of displacement in the Maine class of vessels)it will be readily understood how essential it is that the best and mostresisting armor obtainable should be procured, in order that the great-est possible area of the vessel may be well protected, especially thewater-lLne, machinery space, and gun emplacements, within the limitsof weight allowable for such purposes. The maximum thickness of the side-belt armor on the Alahuviaclass is sixteen and one-half inches, whereas on the Maine class (au-thorized December 12, 1898,) it is proposed to have a maximum thick-ness of twelve inches for the same armor, thus obtaming the sameprotection on about 25 per cent, less weight, and to utilize the weightthus saved by increasing the thickness of the casemate armor whichprotects the six-inch guns to seven inches, as against five and one-halfinches on the Alabama class, thus greatly improving the vessels of theMaine class as regards the distribution

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