high press- while forgetting that an effective expansion (variable by the ure, a maximum expansion, bigh piston speed, efficient steam governor) can only be obtained, so far as engineers have yet jacketing, and perfect regulation: are not fully recognized learned, by the use of a detachable valve… … smal] powers, and another smull engine, furnished by Pick- of the importance of allowing the leas! possible clearance THE GREAT EXPOSITION—LETTER FROM UNITED STATES ering & Davis, is always under inspection. This latter en- by dividing the valve and making of it two, which cover COMMISSIONER…
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