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These shells were manufactured in buildings totaling fifteen miles in length, forty feet in breadth, with more than ten thousand machine tools driven by seventeen miles of shafting with an energy of twenty-five thousand horse-power and a weekly output of over ten thousand tons' weight of projectiles all this largely worked by the women of England.
By use of that law we knew in advance, that is to say, when the original plans for the station were drawn, just what this loss would be, precisely the same as a mechanical engineer when constructing a mill with long lines of shafting can forecast the loss of power due to friction.
To accomplish this would probably require a motor of 3 or 4 H. P. The line shafting driving ceiling fans usually runs about 75 revolutions. To give this speed on the line shaft with a rated speed of 2,000 on the 3 in. pulley of the motor would require a countershaft with a 24 in. pulley belted to the motor.
A modern Samson, dumb as well as blind, its massive limbs of shining steel moved with voiceless grace and utmost apparent ease, driving the miles of shafting and the thousands of connected machines. The cylinders were forty inches in diameter; the piston stroke, ten feet. The great walking-beams, nine feet wide in the centre, weighed eleven tons each.
J.N. Short, who was the foreman of the cold-rolled steel shafting department, sat in the office, and many of the men who filed past had been under him in the works. Mutual Congratulations. There were handshakes all the more hearty and congratulations all the more sincere because of what all had passed through.
The 3 in. pulley on the motor was connected to a 6 in. pulley on the line shafting. The rated speed of the motor was 2,000 revolutions, and had it been able to develop this speed, would have driven the line shaft 1,000 revolutions and the fans a relative speed.
On a contract for three years the electric light company would be money in pocket if they would present the customer with 30 small motors, charging him $1 per month per motor for current, rather than let him buy a 2 H. P. motor to operate the same machines with the necessary shafting at a charge of $18 per month for current.
This is accomplished in the turbine steam-engine by causing the steam to play in strong jets continuously and steadily upon vanes which form virtually a number of small windmills. Thus, while the screw outside of the hull is applying the force continuously, the steam in the inside is driving the shafting with equal evenness and regularity.
The power was communicated by pipes led from the central air or exhaust pump to small vacuum or atmospheric engines devoted to the driving of each separate machine, thus doing away with all shafting and leather belts, the required speed being kept up or modified at pleasure without in any way interfering with the other machines.
The air was all tremulous with the hum of the rapidly revolving dynamos, the thud of the reciprocating machinery, and the grinding of the badly lubricated shafting. Piers Minor knew that he was horribly afraid, but for very shame he could not hold back. Together they stole a little way within the vaulted entrance and listened again. Nothing but the roar of the machinery.
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