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Title: |
1893 Article-Priestman Bros., Double Cylinder Oil Engine |
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Source: |
Engineering Magazine, V55, 23 Jun 1893, pgs 863-868 |
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Insert Date: |
6/19/2012 4:15:40 PM |
Evidence of the growing size and popularity of the oil engine is found in the fact that it has been found necessary to devise a self-starter for it. During the last three or four years there have been a succession of self-starters for gas engines, but this is the first that has appeared for oil engines. It is shown by Messrs. Priestman Brothers, Limited, Hull. This firm has, as usual, a large and handsomely displayed stand, which bears an appearance of actuality and genuine trade, which is not always associated with oil engines. As our readers will remember, t the Priestman engine has a hand pump, by which a slight air pressure can be brought to bear on the store of oil to make it rise into the spray nozzle. This pump is now utilized to gain a store of air of some twenty pounds pressure. When the vaporiser is heated, and the engine set ready to start, the spray is first turned on, and soon afterwards the compressed air. This carries the charge forward, first filling the vaporiser, and then opening the valve between it and the cylinder, and flowing into that. Here the electric igniter is in full action, and consequently an explosion follows, starting the engine, which, on the next cycle, takes in its regular charge and gets away in the usual manner.
An engraving of this arrangement, as applied to a double-cylinder engine, will be found on page 868, the oil reservoir being utilized as the air vessel. In starting the engine the plugs K, K1 are taken out to ascertain that they are clean, the flywheel is turned until the crank has just passed the centre in the direction of rotation, and the valve E is screwed down perfectly tight. The vaporiser D is then warmed in the usual way, but a little hotter than is necessary when not using the self-starter. By means of the air pump F air is pumped into the oil tank I to a pressure of about 25 lb.; when this is done the engine is ready for starting. A piece of tubing C is put between the forks H to make contact, and while the finger J makes contact in the other forks H1. The electric contacts in both cylinders are then in action. The handle L of the six way cock G is now turned on to "start," and after a minute or less, the cock A is opened with the lever B; this allows the compressed charge in the oil tank I to pass through the vaporiser D and find its way into the cylinders R, ft1, where the sparks are waiting to receive it; the explosion then takes place, and the engine starts. Immediately it starts the cock A is closed. As the finger goes round it will knock out the tube in the other forks. Immediately the engine is started the contact forks H, H' cause the electric current to be adjusted in the usual way. |
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1893 Priestman Bros., Double Cylinder Oil Engine
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