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32 Incorporated 1866. THE LOCOMOTIVE. Charter Per- petuaL Issues Policies of Insurance after a Carefnl Inspection of tlie Boilers, COVERING ALL LOSS OR DAMAGE TO BOILERS, BUILDINGS, AND MACHINERY. ALSO COVERING LOSS OF LIFE AND ACCIDENT TO PERSONS ARISING PROM Steam Boiler Explosions- Full information concerning the plan of the Company's operations can be obtained at the Or at any As^eiicy. J. M. ALLEN, President. W. B. FRANKLIN, Vice-Prest. J. B. PIERCE, Secretary. FRANCIS B. ALLEN, 2d Vice-Prest. E. J. MURPHY, M. E., Consulting Engineer. Hoard of J. M. ALLEN, President. FRANK W. CHENEY, Treas. Cheney Brothers Silk Manufacturing Co. CHAIiLES M. BEACH, of Beach & Co. DANIEI> I'HILLIPS, of Adams Express Co. EICILVRI) W. H. .TARVIS, Prest. Colt's Fire Arms Manufacturing Co. THOMAS O. ENDERS, President of the U. S. Banlv. LEVERETT BRAINARD, of The Case, Locliwood & Brainard Co.
PUBLISHED BY THE HARTFORD STEAM BOILER INSPECTION AND INSURAN|;^ COMPANY. Nkw Skkiks—Vol-. XIV. IIAIITFORD, CONN., MARCH, 1893. No. 3. A Dang-erous Safety-Valve. We give, herewith, an account of a safety-valve that \va.s condenincfl by one of our inspectors not long ago. It illustrates a source of danger that happily is not frequently met with — namely, a disproportion of the parts of the valve so great that the strains on some of the parts are much greater than they can .safely withstand. Figs. 1 and 2 give a side and top view of the valve, respectively. The lever was about 50 inches long, from the fulcrum pin to the end, and on it three weiglits were hung. The outer one, A, weighed 134 lb., and was 49 inches from the fulcrum pin. The other two, B and C, weighed 45 pounds each, and their distances from the fulcrum pin were 40 inches Figs. 1 and 2.—A Dangerous Safety-Valve. p 1 FO and 33 inches respectively. The lever weighed 17 pounds, and tapered so little that for practical purposes it could be considered to be of uniform cross section. The fulcrum pin was ^ inch in diameter, and the distance from its center to the nearest edge of the flat-ended valve stem was 2| inches. The disk of this valve was unusually large, and the calculated blowing-off point was not excessively high, and agreed well with the blowing point obtained by trial with the steam gauge. The real point of danger was in the weakness of the fulcrum pin P and the casting supporting it, the dimensions of which are sufficiently indicated in Figs. 3 and 4. To calciilate the strain on the fulcrum pin and its casting, let usi first consider what would happen if either of these gave way. Plainly the lever would turn about the point F where it touches the valve-spindle, the weighted end falling down, and the fulcrum end tipping up. The only thing that resists this tendency is the downward
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86 THE LOCOMOTIVE. [June, (105.)
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96 Incorporated 1866. THE LOCOMOTIV
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98 THE LOCOMOTIVE. [July, worked ov
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102 THE LOCOMOTIVE. [July, (132).
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110 THE LOCOMOTIVE. [July without t
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112 THE LOCOMOTIVE. [July. Incorpor
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114 THE LOCOMOTIVE. [August, to whi
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116 THE LOCOMOTIVE. [August, tion.
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118 THE LOCOMOTIVE. [August, (147.)
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124 THE LOCOMOTIVE [August, hard en
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-[34 THE LOCOMOTIVE. [September, Fi
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140 THE LOCOMOTIVE lSeptember, On a
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d42 THE LOCOMOTIVE. [September, cas
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144 Incorporated 1866. THE LOCOMOTI
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146 THE LOCOMOTIVE. [Octobek, in pl
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i48 THE LOCOMOTIVE. [October, Natur
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[50 THE LOCOMOTIVE. [October, Curti
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^54 THE LOCOMOTIVE. [Octobeb, Mkt e
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-[56 THE LOCOMOTIVE. [October, Tlie
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158 THE LOCOMOTIVE. [October, Of co
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162 THE LOCOMOTIVE. [November, that
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166 THE LOCOMOTIVE. [November, boil
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170 THE LOCOMOTIVE. [November, KILL
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174 THE LOCOMOTIVE. [:November, sel
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^82 THE LOCOMOTIVE. [December, that
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190 THE LOCOMOTIVE. [December, Such
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i92 Incorporated 1866. THE LOCOMOTI
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INDEX, Equivalent of heat, redeterm
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