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i                                    xviu                                      FOREWORD
error; but it is impossible to do everything at the same time and
in a single step. It was necessary to establish the fundamental
idea firmly, and in doing this the minor details were temporarily
neglected. When it has been firmly established that the circula-
tion of the hot gases in a furnace is a problem in hydraulics,
when the fog which has obscured these problems and appeared
to make them insoluble has been cleared away, then it will become
possible to settle the various details in a suitable manner.
The complete working out of the laws governing the theory of
the circulation of the hot gases, which has been commenced by
Professor Yesmann, should be continued by experts in hydraulics.
It is our province, as men of deeds, to check the working methods
of existing furnaces and to deduce therefrom the practical rules
which it is necessary for us to know in determining their design.
I am at present engaged in this work, as are many of my
students who are constructing furnaces in numerous workshops in
Russia. When sufficient progress has been made, it will be
possible to give the methods for the design computations of all
types of furnaces.
The very simplicity of the conclusions to which I was led were
rather disconcerting. But their approval by my colleagues at the
Polytechnic Institute—M. Kir pitch ow, Professor of Applied
Mechanics, and M. Mechtchersky, Professor of Theoretical
Mechanics—encouraged me to publish the original of the present
It was only natural that I should desire to submit my work to a
high authority, such as M. Le Chatelier;  the translation of the
work into French afforded such an opportunity, and I am greatly
I i -j                            pleased by the honor which he has conferred upon me in introduc-
| ' |]                            ing me, in such flattering terms, to my new readers.
February, 1914.