. The railroad and engineering journal . for a50-ton hammer of Marrel Brothers. Fig. 44 shows graphically the diameter of the circularvalves of hammers whose power varies from i to 100tons. It will be seen that above 50 tons the dimensionand travel of the valves are so great, that it will be veryuseful to have them worked by a separate motor, or smallauxiliary engine, in such away as to reduce to a minimumthe effort to be put forth by the hammerman. In fig. 44 the ordinates represent the diameter to begiven to the valves in millimeters ; the abscissa; representthe power in tons of the differen
. The railroad and engineering journal . for a50-ton hammer of Marrel Brothers. Fig. 44 shows graphically the diameter of the circularvalves of hammers whose power varies from i to 100tons. It will be seen that above 50 tons the dimensionand travel of the valves are so great, that it will be veryuseful to have them worked by a separate motor, or smallauxiliary engine, in such away as to reduce to a minimumthe effort to be put forth by the hammerman. In fig. 44 the ordinates represent the diameter to begiven to the valves in millimeters ; the abscissa; representthe power in tons of the different hammers. The following formula may be used to find the diameterof a circular valve, the size of the exhaust valve of a ham-mer of the same power being known. Let D be the diani Vol. LXII, No. 8.] ENGINEERING JOURNAL. 353 eter of the exhaust valve of tlie corresponding ham-mer ; 5 the area of this valve ; D the diameter of thecircular valve ; L the circumference of this valve, andIi the width of opening of the valve, which ought to be.
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