Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 13, 2025
Watt, though greatly irritated, was not discouraged. His engines were not, in the first place, like Newcomen's, mere pumps, mere draining-pumps. In a few years he transformed them into universal motive powers, and of indefinite force. His first step in this line was the invention of a double-acting engine (
A rotative engine, or steam-wheel. Here we have three of the vital elements required toward the completion of the work: first, steam used expansively; second, the double-acting engine.
Each main pump is 10 in. diameter, horizontal, double-acting, worked by a prolongation backward of the piston-rod. The valves and seats are of gun metal, 81/2 in. diameter. The capacity is 350 gallons per minute, raised 206 ft. The air vessel is 21 in. internal diameter and 6 ft. high, and is fitted with a hand pump for renewing the supply of air if necessary.
In all of these Watt recommended that a fly-wheel be used to regulate the motion, but in the specification for the patent of the following year, 1782, his double-acting engine produced a more regular motion and rendered a fly-wheel unnecessary, "so that," he says, "in most of our great manufactories these engines now supply the place of water, wind and horse mills, and instead of carrying the work to the power, the prime agent is placed wherever it is most convenient to the manufacturer."
"Yes; and I think she's a much better craft, too, Father." "Glad to hear that, Tom. Of course you kept the gyroscope rudder feature?" "No, I didn't," replied Tom. "If I had left that installed it would have meant carrying a smaller diving bell, and I think that last will be more useful than the gyroscope. I put in a set of double-acting depth rudders instead." Mr. Swift shook his head.
Each of them had two bicycles for his own use, and as they were all constructed with the new double-acting levers, they passed backwards and forwards along the bicycle track between the city and Crasweller's house with astonishing rapidity. I used to hear that the six miles had been done in fifteen minutes.
In the figures, a is the Steam Cylinder b, the Steam Chest d, a handle for regulating the steam valve f, the starting bar g, g, tappets attached to the valve rod, which is moved by the contact of the arm e, on the piston rod with said tappets h, the double-acting water plunger working through a packing ring o, o, force valves o', o', suction valves.
The connecting rod is attached at one end to a pin fixed in the middle of the trunk, while the other end engages the crank in the usual manner. The air pump is set within the condenser, and is wrought by a rod which is fixed to the piston and derives its motion therefrom. The air pump is of that species which is called double-acting.
The steadying effect of the fly wheel and the positive action of the valve make it possible to use a larger pump plunger than is advisable with the striking gear. With a pump piston of considerably greater diameter than the piston rod, the pump may be made double-acting, a gland being fitted at the front end for the piston rod to work through, and, of course, a second set of valves added.
The air is admitted to the large cylinder through the piston, is compressed to about 30 pounds, and on the return stroke the pressure is raised to almost any point required, and in proportion to the diameter of the smaller cylinder. Though single-acting, the capacity of one of these compressors is about equal to that of the double-acting machine of the same cost of construction.
Word Of The Day
Others Looking