The Artizan . D = Diameter in feet. L = Length in T = Thickness in inches. t = Thickness in thirty-seconds. d = Diameter of stays in inches, at smallest part. B =• Bursting pressure in pounds per square inch. C = Collapsing pressure ditto P -= Working pressure ditto S = Distance between stays in inches. R = Distance between stays in diam. of the stay. Cylindrical Boilers Ditto ditto Ditto ditto Ditto ditto Internal Flues, from xam- ^°\fin. plates •> Stayed Flat Surfaces,such as the sides of thefire-box of a locomotiveboiler, the stays beingscrewed into the plateswithout nuts Iron Cop
The Artizan . D = Diameter in feet. L = Length in T = Thickness in inches. t = Thickness in thirty-seconds. d = Diameter of stays in inches, at smallest part. B =• Bursting pressure in pounds per square inch. C = Collapsing pressure ditto P -= Working pressure ditto S = Distance between stays in inches. R = Distance between stays in diam. of the stay. Cylindrical Boilers Ditto ditto Ditto ditto Ditto ditto Internal Flues, from xam- ^°\fin. plates •> Stayed Flat Surfaces,such as the sides of thefire-box of a locomotiveboiler, the stays beingscrewed into the plateswithout nuts Iron Copper- Round Iron Stays, with fresh ditto ditto ... 509288 5092810 ditto 5092810 Straiaper inch. 32-HM)1 33600 340008 34000 31520 286221 286228 50928 B = 450p = 700 T P = D 263 P = C = B = D 354D 66 (t - 1)3LD 720 t\S3 B 90 t-S3 400 t- Ss 50*2 p _ ov z- p = S3 5O00^2 P = S2 5000 R= p = 4000 rf2 P = S24000 R? T = T = £-inch. 1 + t = d~B. D= 12 T 700 T D=- D = 263P 354 = 66 (t - 1)2CL. 28 Speed of Armoured Ships. [The Artizan,Feb. 1,1861. The following table gives these ratios, which are the distances betweenthe stays expressed in diameters of the stay. Thus at 50 lbs. pressure in afresh water boiler, the distance between the centres of two stays is tentimes the diameter of a stay. T>„„ Pressure, fresh water, Pressure, salt water, -vauo. lbs. per sq. in. lbs. per sq. in. 4 312 250 5 200 160 6 139 111 7 102 81 8 78 62 9 61 49 10 50 40 11 41 33 12 35 30 13 30 24 14. 25£ 20 15 22 17 18 15* 12i 16. The diameter of the stay is equal to the distance between the staysdivided by the square root of (5000 divided by the working pressure). 17. The distance between the stays is equal to the diameter of the staymultiplied by the square root of (5000 divided by the working pressure). In the rule for flat surfaces I have assumed that the strength would varyas the square of the thickness of the plate. The experiments referred todo not enable us to test the tr
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