TABLE of the Ultimate Breaking Weight, in tons, of cast-iron pillars, calculated from Professor Hodgkinson's Formula. The length includes every half-foot from 1 to 20, and the diameter every inch from 1 to 24. LENGTH TABLE of the Ultimate Breaking Weight, in tons, of cast-iron pillars. Note-Example. Find the breaking weight of a cast-iron pillar whose external diameter is 17, and internal diameter 15 inches, and length 18 feet. TABLE of the Ultimate Breaking Weight, in tons, of cast-iron pillars. (Continued.) tons. tons. 957714 1191290 1463470 480707 597950 734563 294769 366664 450443 201717 250912 308238 tons. Along the line marked 18 feet, and in the vertical lines numbered 17 and 15 inches, take the numbers 8751 and 5577; the difference of which, namely 3174, will be the breaking TABLE of the Ultimate Breaking Weight, in tons, of cast-iron Pillars. (Continued.) 1777940 2138510 2549140 3018880 3536910 4122530 11 892404 1073380 1279490 1512760 1775280 2069230 658204 784589 927630 1088610 1268880 450416 536902 684786 250 251 203024465605 2 31 137865 165825197666 5 358269 168428 202586 241485 285511 335059 390543 233703 274260319671 115257 138632 165251 195378229286 267248 54 98017 117894-140532 166157 194988 227273 84539 101684 121210 143307 -7378488748105789 125047 168177 196023 61 146781171085 27 65051 78243 93266 110270 129406 150832 7호 115085134140 8 51840 62353 774326 $87876 103126120200 81 46763 56247 67047 79271 93028 108430 4243361038 weight in tons. For practical purposes the pillars should be calculated to bear one half more than the weight to which they are subjected. OK ་ལྷན་ཁག་ ག ན་ TABLE OF STRENGTHS OF CAST-IRON SHAFTS. The cube of the diameter of a The cube of the diameter of a journal or shaft of sufficient strength is directly as the horse power, and inversely as the number of revolutions of the shaft per minute. Mr. Robertson Buchanan deduced from several experiments that a journal suitable to a 50-horse engine, making 50 revolutions per minute, should be 74 inches in diameter. It is from these data the following table has been computed. NUMBER OF REVOLUTIONS OF SHAFT PER MINUTE. Power. 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 110 120 130 Horse |