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D. VAN NOSTRAND, PUBLISHER,

23 MURRAY AND 27 WARREN STREETS.

1886.

Copyright, 1886.

BY JOHN L. CULLEY.

PREFACE.

I have attempted in this treatise to attain two results:

First. To supply our American engineering literature with a short, clear treatment of the construction of Helicoidal Oblique Arches; and,

Second.-To render simple all problems connected with their theory or construction. I especially hope that I may make the second plain to all who shall read these pages.

Long since I have been satisfied that much of the confusion and misunderstanding arising from the attempts to understand this subject, have arisen from the fact that authors have failed, either to state the fundamental principle, or to keep it constantly before the student's mind. Hence the general opinion has arisen that helicoidal arches are of the most intricate construction, and too often

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