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Incorporated 1866. Charter Per- petual. Issues Policies of Insurance after a Careful Inspection of the Boilers, COVERING ALT. LOSS OR DAMAGE TO BOILERS, BUILDINGS, AND MACHINERY, AND DAMAGE RESULTING FROM LOSS OF LIFE AND PERSONAL INJURIES, AUSED liV Steam Boiler Explosions. Full iiifuniiution concerning the plan of the Company's operations can be obtained at the JOZMI^^-lNT^r'S OFFICE, HAETFOED, COILTILT., Or at anv Agency. J. M. ALLEN, President. J. B. PIERCE, Secretary. W. B. FRANKLIN, Viee-Prest. L. B. BRAINEBD, Treasurer. FRANCIS B. ALLEN, 2d Viee-Prest. L. F. MIDDLEBROOK, Asst. Sec. E. J. MURPHY, M. E., Consulting Engineer. Board of 1. M. ALLEN, President. FRANK W. CHENEY, Treas. Cheney Brothers Silk Manufacturing Co. CHARLES M. BEACH, ' Beach & ' DANIEL PHILLIPS, of Adaine Express Co. RICHARD W. II. JARVIS, P Fire Anns Manufacturing 1 LEVERETT BRAINARD, of TheCase, Lockwood & Brainard 1 !o. Gen. WM. B. FRANKLIN, late U. S. Commissioner to the P - ion. Hon. FRAN< is B. COOLEY,of the National Exchange Bank. Hartford, Conn. GEORGE BURNHAM, Baldwin Locomotive Works. Philadelphia. GENERAL AGENTS. TIIEO. II. BABCOCK, CORBIN & GOODRICH, LAWFORD & McKUI, C. F ROBERTS, H. M. LEMON, G \I! DINER. Jr., S. R BENJAMIN, W. G. LINEBURGH & SON, BURWELL&BRIG - JAMES W. ARROTT, Ltd.. MANN A: WILSON, TIIOS. F. DALY, W. S. II ^STIE & SON. LOUTS V CLARK & CO., PETER F. PESCUD. CHIEF INSPECTORS. It K. McMURRAY, WM. J FARRAN, RE. MUNBO, F. S. ALLEN. JAMES L. FOORD, VKTOR BUGO, F. 8. ALLEN. J. II. RANDALL. C. A. BURWELL. BENJAMIN FORD, J. B. WARNER. T. E. SHEARS. \V. M FRANCIS. II. E. STRINGFELLOW, F. C. BITC.OOD, Directors. Hon. NATHANIEL SHTPMAN, Judge United Slates Circuit court. President Smyth Manufacturing Co., KIMBALL, I I Hartford, Conn. PniLIP CORBIN. P. & F. Corhin, New Britain, 1 OI1IJ. GEORGE A. FAIRFIELD. Prest Hartford Machine Company. J. B. PIERCE, Secretary Hartford Steam Boiler Inspeclion and Insurance Co. ATWOOD COLLINS, Pres. Security Co., Hfd, Conn. II 1 [US F. ROBINSON, Hartford. Conn. JOHN O. FNDERS, United States Bank, Hartford, Conn. New York Crrr. Philadelphia. Pa. Baltimore, Md. Washington, D. C. Boston, Ma--. Providence, R. I. Chk ago, III. St. Louis, Mo. Hartford, Conn. Bridgeport, Conn. Cleveland, Ohio. Pitt-kilo. Pa. San Francisco, c a l. Denver. Col. Charleston. S Birmingham. Ala. New Orleans, La. OFFICES. office. 160 Broadway. 432 \Y .-limit St. " Chamber Commerce. - 511 Eleventh St.. N.W. 12.- Milk St. 29 Weybossel 81 169 Jackson St. 319 North Fourth St. 6.-0 Main Street " 1 Sanford Building. " 908 Superior St. 401 Wood St. 306 Saneome St. " 210-215 Tabor Op. Bldg. " 44 Broad St. 2021 First Ave. 818 Gravier St.
She jfttotmrtttre* PUBLISHED BY THE HARTFORD STEAM BOILER INSPECTION AND INSURA COMPANY. Vol. XXII. HARTFORD, CONN., JULY, 1901. /, No. Tf Concerning' Pressed Steel Braces. In the May issue of The Locomotive we printed an article entitled "A Common Defect in Bracing," in which we drew attention to the fact that it is by no means uncommon for boiler makers to provide adequate strength in the body of a brace, while leaving the blade, or part by which the brace is secured to the shell, altogether too weak across the line where the first rivet hole comes. The article in question aroused a great deal of interest, if we may judge by the considerable correspondence that it has called out ; and for this reason we desire to supplement it by a few more remarks on the same subject. In the previous article, we discussed only the solid type of brace, which is forged up out of round iron. The so- called " formed braces," which are stamped or pressed into shape out of sheet metal, are coming more and more into favor, in place of the forged kind, both because they are cheaper, and because they have no weld. We desire to call attention, however, to the fact that the formed braces are also liable to the same defect that we have already indi- cated in connection with the solid ones. Fig. 1. — D B The Shell End of a Pressed Steel Brace. Fig. 1, for example, represents the shell end of a formed brace, with two rivet holes to secure the brace to the shell. Such braces are almost invariably made strong enough along the section CD, but are often too weak along AB, owing to the removal of metal at this point, in making the rivet hole. It is common to find the brace 2f in. wide at AB, over all ; and the usual thicknesses of material are §", T 7 5 ", and J". Taking the |" brace as an example, we see that the sectional area of the solid part of the blade (aloug CD) is |" x 2f " = 1.03 sq. in. The error that we wish to call attention to consists in counting a brace of this sort as though it had a full square inch of sectional area, just because it has such an area in the solid part. For the weakest section of the brace is plainly that along the line AB, where the rivet hole is punched. Assuming that the rivet hole is f§" i Q diameter, or (expressed decimally) 0.8125", it is evident that the effective section, across AB, has a width of only 2.75"-0.8125" = 1.9375". The effective sectional area at this point is therefore
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