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NEW YORK:
D. VAN NOSTRAND, PUBLISHER,
23 MURRAY AND 27 WARREN STREET,

1873.

192.14
HARVARD UNIVERSITY
LOL OF ENGINEERING
JUN 20 1917

TRANSFERRED TO
MAN COLLEGE KIARARY

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I do not claim to have discovered anything new in the art of ventilation. All I have endeavored to do in the following pages is to lay down principles, which shall be applicable to almost every case where ventilation is required.

One object of the paper is to insist upon the great and increasing importance of the subject, and, if successful in this, I am satisfied that it will not have been read in vain.

Before proceeding further, I think it will be desirable to explain what I mean by the term “Ventilation.” Briefly, it is this,-a gradual, continuous and complete changing of the air contained in any structure, a substitution, in fact, of fresh air for foul, but so gradual a substitution that the motion of the air should be imperceptible.

Of course, in factories, imperceptibility

192.14

HARVARD UNIVERSITY CHOOL OF ENGINEERWA

JUN 20 1917

TRANSFERRED TO поль

Inn COLLEGE LIERARY

I do not claim to have discovered anything new in the art of ventilation. All I have endeavored to do in the following pages is to lay down principles, which shall be applicable to almost every case where ventilation is required.

One object of the paper is to insist upon the great and increasing importance of the subject, and, if successful in this, I am satisfied that it will not have been read in vain.

Before proceeding further, I think it will be desirable to explain what I mean by the term “Ventilation.” Briefly, it is this,-a gradual, continuous and complete changing of the air contained in any structure, a substitution, in fact, of fresh air for foul, but so gradual a substitution that the motion of the air should be imperceptible.

Of course, in factories, imperceptibility

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