Les moteurs diesel pour la terre et les travaux maritimes . h cylindre. Ces bouteilles à agir comme moteurs de l'air, en whichthe piston, forcés ne^^lwards un par l'admission d'air,provoque la des manettes de la soupape d'échappement et de carburant d'être inletvalve soulevé leurs cams. Cela fait, l'arbre à cames est alors en mesure de se déplacer longitudinalement et lecontacteur cams sont portées sous le valverod divers leviers. Les rouleaux des leviers sont puis une fois sur le bas morebrought à leur came et le moteur est en marche arrière ou une placepour. Le moteur est mis en place par air comprimé, avant le levier du robinet de carburant est dropp

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Diesel engines for land and marine work . h cylinder. These cylinders act as air motors, in whichthe piston, being forced do^A^lwards by the admission of air, causes the valve levers of the exhaust valve and fuel inletvalve to be raised off their cams. This having been done, the cam shaft is then able to move longitudinally, and thereverse cams are brought underneath the various valverod levers. The rollers of the levers are then once morebrought down on to their cam and the engine is in a positionfor reverse running. The motor is started up by compressedair, before the fuel valve lever is dropped down on to its camand fuel admitted into the cylinders. In the larger enginesall these operations are carried out by compressed air inthe usual way, but in the smaller type it is thought betterto effect the various movements by hand. CONSTRUrTTON OF DIESEL MARINE ENGINE 295 Small Diesel Marine Engines.—At the present timeit may be said that the minimum limit for Diesel enginesfrom a commercial point of view for land work is about 50. B.H.P., below which power it is generally found advisableto employ a motor of lower first cost even though the fuelconsumption is higher. There are one or two exceptionsto this such as small horizontal motors which are made 29G DIESEL ENGINES FOR LAND AND MARINE WORK in such large numbers as to reduce the cost of constructionand put the engines on a par from the point of view of costwith other types such as the hot bulb engine. For marine work it has generally been thought that theDiesel engine is hardly particularly applicable below powersof about 200 H.P., mainly again owing to the first cost, andalso because of the greater simplicity of other types. Thereare, however, many engines of 100 H.P. and upwardsdesigned to be specially suitable for installation in craftrequiring about this power for their propulsion. Theseneed not be discussed at length as they have none of themreceived wide application and have in fact only been adoptedin special

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