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There are many engineers and others interested in refrigerating machinery who have felt the want of a book of reference that will enable them to determine, with sufficient accuracy for all practical pur poses, what work their machines are doing without resorting to laborious calculations; therefore a number of tables have been pre pared to meet this want, and a short treatise on the Theory and Practice of Refrigeration incorporated therewith. The tables, which have been calculated as accurately as possible, and have been checked by a gentleman of considerable expert experience, cover a sufficiently wide range of temperatures and pressures to meet all ordinary, and a good many extraordinary, requirements.
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