Suction gas plants . he gas from the producer and to force the chargeinto the engine cylinder, the exhaust escaping through a ring ofports uncovered by the piston at the end of the working presence of this pump, driven from the motor cylinder, gavethe engine a bad mechanical efficiency. In fact, when tested byProfessor Witz in 1894, one of these plants developed 276 full load, and only 1459 , giving a mechanical efficiency of•53. The fuel consumption, moreover, was 157 lbs. of anthraciteper , whilst pressure plants at that time were only using11 lbs. per
Suction gas plants . he gas from the producer and to force the chargeinto the engine cylinder, the exhaust escaping through a ring ofports uncovered by the piston at the end of the working presence of this pump, driven from the motor cylinder, gavethe engine a bad mechanical efficiency. In fact, when tested byProfessor Witz in 1894, one of these plants developed 276 full load, and only 1459 , giving a mechanical efficiency of•53. The fuel consumption, moreover, was 157 lbs. of anthraciteper , whilst pressure plants at that time were only using11 lbs. per Still, it was a step in the right direction,and it was certainly the birth of the present-day suction plant,which is therefore only fourteen years old. Moreover, the workof Bonier caused many clever inventors to fix their attentionon this type of plant, with the result that it was very soonimproved. The most notable of these improvements was that APPLICATIONS AND USES OF THE SUCTION PLANT. 81 Gas to Engine Cylinder. Fig. 21.—Bonier Producer Plant. 82 SUCTION GAS PLANTS. which caused the suction stroke of the engine itself to draw thegas from the producer, thus doing away with the suction pump,and considerably increasing the mechanical efficiency of theengine. Since that time there has been no great alteration inprinciple of the suction producer, the improvements being mainlyin the perfection of the various details. I shall therefore pass onat once to the more modern designs, omitting any description ofthe various plants that come between in the matter of develop-ment. First of all, perhaps, it will be as well to give a brief descriptionof a modern type .of Pressure Plant, in order to show moreclearly the fundamental differences in design between the twokinds of plant. 500 Bitmninous Coal Gas Plant.—The generatorconsists of a rectangular riveted steel shell, lined with firebrick,and closed by a water seal at the bottom. The water trough runsacross the producer at ri
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