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of gas from the producer; if leakage takes place, it is from the atmosphere into the producer itself. There are so many combined plants consisting of a gas engine working in conjunction with a suction producer at work for stationary purposes, that it might appear only very small alterations would be required in these. plants to "TAE. MaRINE. REVIEW 'tails of the apparatus all having to be specially worked out for the new condi- tions, The producers for moderate sized powers are usually worked with anthra- cite coal, and where vessels are to be used on fixed routes, and the same class of fuel can always be obtained, anthra- cite or coke will be found to be the most WATERTIGHT BALLAST 1 (CO) Fig. 5. 3 There are, of course, very many large. land installations of pressure producers working with bituminous coal, but the apparatus for extracting the tar and other by-products, as at present arranged, is far too cumbrous for marine work, and the marine producer. to deal with this class of coal must be designed on entirely different lines, being arranged to con- HALF SECTION ATQ° 4, CHAINS & STORES WATERTIGHT WELL GAS MOTOR LAUNCH adapt them for marine propulsion; but in addition 'to the great difference be- tween almost all marine and land plants, viz., that of the quick and frequent varia- tions of load which the smaller types of marine plants have to undergo, there are very many features which must be changed to adapt the gas engines and producer for boat work. In fact, it will be found that the principle of operation will be about the only thing which can be identical with the land plant; the de- "BMIL CAPITAINE." LENGTH 60' 0. SLIDING HATCH ee Ee THE Capitaine Suction Gas PLANT suitable for moderate powers, it being too difficult to make a satisfactory small plant to work with bituminous coal. For larger powers, and for vessels that have to take up fuel at different ports, the producer must be capable of dealing with coal, other than anthracite, which may be of a tarry or caking character. The design of the producer capable of successfully dealing with bituminous or caking coal is a much more difficult problem than the anthracite producer. BEAM 10' 0". DEPTH' 4' 9", sume the tar which is evaporated off from the coal in the first stages of its heating. This has been arranged in some producers by taking the gas off. at a comparatively hot part of the fire, in- stead of at near the top of the new coal, as is usually the case with the anthracite producer, but there are plants now at work dealing successfully with bituminous caking coal, which. are : fed by an undertype stoker, so that the new coal is forced:into the hottest part of the