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20 THE LOCOMOTIVE. [February, could be iuferred with considerable precision. It will be impossible to give the results of these tests in detail in this place, but the foregoing abstract of five of them shows quite well that the strength of steel is greater at about 500° Fah. than it is at 70°. The temperatures are all on the Fahrenheit scale. These five series of tests were made with five difl^erent qualities of steel, containing, respectively, .09, .20, .31, .37, and .51 per cent, of carbon. The figures given in the columns headed "Percentage of Strength" were obtained by dividing the tensile strength of a samj^le of steel at the given temperature by the strength of the same quality of steel at 70° Fah. : It will be seen that these specimens were all stronger in the neighborhood of zero than they were at ordinary temperatures; and that, in fact, they all show a minimum of strength at 210°, or thereabouts, and a maximum of strength at about 550°. This curious property of iron may now be considered to be well established ; and it deserves further attention than it has yet received. Inspectors' Report. November, 1892. During this month our inspectors made 6,013 inspection trips, visited 12,457 boilers, inspected 4,621 both internally and externally, and subjected 714 to hydrostatic pressure. The whole number of defects reported reached 9,952, of which 1,029 were considered dangerous ; 40 boilers were regarded unsafe for further use. Our usual summary is given below Nature of Defects. Cases of deposit of sediment. ... - Cases of incrustation and scale, Cases of internal grooving, ... .... Cases of internal corrosion, - - - Cases of external corrosion, Broken and loose braces and .... stays, - Settings defective, - . . - - ..... Furnaces out of shape, Fractured plates, - . . - - Burned plates, ... Blistered plates, . . . . - Cases of defective riveting, - - - - Defective heads, . . . - - Serious leakage around tube .... ends, Serious leakage at seams, Defective water-gauges, .... Defective blow-offs, . . _ . Cases of deficiencj' of water, . . - Safety-valves overloaded, Safety-valves defective in construction. Pressure-gauges defective, . . . - Boilers without pressure-gauges, . - - Unclassified defects, . . - - . Whole Number.
: 189:{.J THE IJ) To M ()T I V K. 21 Dkcemuku, 1892. Duriiig tliis month our inspectors nmde (},r)91 inspc'ctioii tri|)s, visited 12,938 boilers, inspectfd 4,984 both inli rnally and externally, and subjccti-d (i:54 to liydrostatic pressure. The whole miniber of defects rejiorted reached 10,;}22, of wliich 1,1:50 were (;on- sidered dangerous; 74 l)oiiers were regarded unsafe for furtiier use. Our usual summary is given below Nature of Defects. Cases of deposit of se
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70 THE LOCOMOTIVE. [May, by tirlce
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72 THE LOCOMOTIVE. [May, Boiler Exp
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80 Incorporated 1866. THE LOCOMOTIV
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82 THE LOCOMOTIVE, [June,
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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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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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128 THE LOCOMOTIVE. [August. Incorp
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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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[50 THE LOCOMOTIVE. [October, Curti
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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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172 THE LOCOMOTIVE [November, Boile
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174 THE LOCOMOTIVE. [:November, sel
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178 THE LOCOMOTIVE. [December, grap
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188 THE LOCOMOTIVE [Decembeb, angle
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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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