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We take pleasure in adding our names to the list of recommendations of Haswell's Engineers' and Mechanics' Pocket Book, which we consider the best of the kind.

1. P. MORRIS & Co.,

Steam Engine Manufacturers,
Philadelphia, Penn.

With much pleasure we add our testimony to the value of Haswell's Engineers' and Mechanics' Pocket Book, which we are gratified to learn is about to be published in a fifth edition, as each succeeding issue contains valuable additions to the preceding.

There are several valuable English works of this description, but the peculiarities and differences in this country render his a far more useful book; we consider it, in fact, an almost indispensable pocket companion.

MURRAY & HAZLEHURST, Vulcan Works, Baltimore, Md.

We concur in recommending Haswell's Engineers' and Mechanics' Pocket Book, and consider it a very useful and valuable work.

A. & C. REEDER,

Steam Engine Manufacturers,
Baltimore, Md.

In the daily use of Haswell's Engineers' and Mechanics' Pocket -Book, we concur in the recommendation of it as one of very general reference and great utility; it is an indispensable pocket companion.

August, 1848.

REANEY, NEAFIE & Co., Penn Works, Kensington, Phila

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STEAM ACTING EXPANSIVELY...... 275 BLOWING OR BLAST ENGINES...... 288

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