Greek and Roman Technology by Andrew N. Sherwood;Milorad Nikolic;John W. Humphrey;John P. Oleson;

Author:Andrew N. Sherwood;Milorad Nikolic;John W. Humphrey;John P. Oleson;
Language: eng
Format: epub
ISBN: 9781317402404
Publisher: Taylor & Francis (CAM)
Published: 2020-08-15T00:00:00+00:00

Hero, Pneumatics 1.28

The force pumps used in conflagrations are made as follows [fig. 9.10]. Take two vessels of bronze a b c d, e f g h, having the inner surface smoothed off to fit a piston (like the cylinders of water-organs), k l, m n being the pistons fitted to them. Let the cylinders communicate with each other by means of the tube q ο d f and be provided with valves, p and r, such as have been explained above, within the tube q ο d f and opening upwards from the cylinders. In the bases of the cylinders open up the circular apertures s and t, covered with the polished discs u w and x y, through which insert the spindles z and z soldered to or in some way connected with the bases of the cylinders and provided with shoulders at the extremities that the discs may not be forced off the spindles. To the centre of the pistons fasten the vertical rods A and B and attach to these the beam C D, working at its centre about the stationary pin G, and about the pins E and F at the upper ends of rods A and B. Let another vertical tube H J communicate with the tube q ο d f and branch at J into two arms, which are provided with pipes fitted inside one another, through which it forces up the water, such as were explained in the description of the machine for producing a water-jet by means of the compressed air [in the same work, 1.10]. Now, if the cylinders, provided with these additions, be plunged into a vessel containing water L M N O and the beam C D be made to work at its extremities, which move up and down about the pin G, as they descend, the pistons will drive out the water through the tube H J and the moveable nozzle Q. For when the piston m n ascends, it opens the aperture t as the disc x y rises and shuts the valve r. But when it descends, it shuts t and opens r, through which the water is driven and forced upwards. The action of the other piston, k l, is the same. Now the small pipe Q, which waves backwards and forwards ejects the water to the required height but not in the required direction, unless the whole device be turned around – which in emergencies is a tedious and difficult process. In order, therefore, that the water may be ejected easily to the spot required, let the tube H J consist of two tubes, fitting closely together lengthwise, of which one must be attached to the tube a b c d and the other to the part from which the arms branch off at J, and thus, if the upper tube is turned around, the inclination of the mouthpiece Q, the stream of water can be directed to any spot we please. The

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.