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 Preface.

The chapters comprising this book were originally written as a series of articles for The Engineering Record and have been somewhat revised for their present form.

It has been the aim of the writer to present briefly the theoretical considerations involved in the design of heating and ventilating plants, and to compile the best of the large array of empirical formulas and data in a way that will be of value to those interested in the current practice of the art.

The writer has taken the liberty to refer frequently to previous works on the subject, and principally to those of Mills, Baldwin and Carpenter. He wishes to acknowledge special indebtedness to Mr. Alfred R. Wolff for many valuable data.

5em

Chicago, August, 1901.