. The railroad and engineering journal . in diameterand 100 mm. thick, heated to a clear cherry red—about1,000 Cent., or 1,832° Fahr. —the blocks being heated inthe same furnace and submitted to the action of the twotools—hammer and press—at the same time. 1. First block (fig. 170), fall, h = meter ;ness, <? = mm. ; compression, ii = mm. 2. Second block (fig. 171), fall, // = :ness, f = mm. ; compression, a = mm. 3. Third block (fig. 172), fall, // = meters ;ness, f =r mm. ; compression, a = mm. All the lines traced on the circumference re
. The railroad and engineering journal . in diameterand 100 mm. thick, heated to a clear cherry red—about1,000 Cent., or 1,832° Fahr. —the blocks being heated inthe same furnace and submitted to the action of the twotools—hammer and press—at the same time. 1. First block (fig. 170), fall, h = meter ;ness, <? = mm. ; compression, ii = mm. 2. Second block (fig. 171), fall, // = :ness, f = mm. ; compression, a = mm. 3. Third block (fig. 172), fall, // = meters ;ness, f =r mm. ; compression, a = mm. All the lines traced on the circumference remained visi-ble, being parallel and almost equidistant, except Nos. Iand 9, which nearly approached the top and bottom lines,Nos. o and 10 in the figures ; all the layers increased indiameter, but more at the center than at top and greatest diameter is found a little above the middle—that is, between the lines 5 and 6 ; moreover, the layersexposed to the direct action of the hammer were more ex- thick-thick-thick-. lines I and 9 disappeared, becoming merged in the top andbottom lines ; thickness, <^ = mm. ; compression,a = mm. 3. Third block (fig. 169), fall, // = meter ; thick-ness, c = 39 mm. ; compression, « = 61 mm. The linesI, 2, 8, and 9 disappeared, all the other lines—3, 4, 5, 6,and 7—remaining parallel and almost equidistant. Three similar blocks were then submitted to the action ^y- n^- tended than the opposite ones, the difference of diameterin the case of the greatest fall—No. 3—being as much as10 mm. The three blocks submitted to the action of the pressgave, for compressions equal to those tried under the ham-mer, pressures /equal to 42, 59. and 80 tons, gives us coefficients A, equal to , , and ,respectively, or an average of It may be noted that the surfaces in contact with thepress were not modified, while those in the center werespread or enlarged considerably. In fig. 172 the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
