ELEMENTS OF 
DESCRIPTIVE GEOMETRY 
By ALBERT E. CHURCH, LL.D., late Professor of 
Mathematics, United States Military Academy, and 
GEORGE M. BARTLETT, M.A., Instructor in 
Descriptive Geometry and Mechanism, University of 
Michigan. 
|2.25 
Part I. Orthographic Projections. $1.75 
THIS is a modern treatment of descriptive geometry with 
applications to spherical projections, shades and shadows, 
perspective, and isometric projections, for the use of 
technical schools and colleges. Though based upon Professor 
Church's Descriptive Geometry, and retaining as much as 
possible the original lucidity and conciseness, this work differs 
from it quite widely. 
Among the salient features of the book are the following: 
The figures and text are included in the same volume, each 
figure being placed beside the corresponding text; General 
cases are preferred to special ones; A sufficient number of 
problems are solved in the third angle to familiarize the stu- 
dent with its use; A treatment of the profile plane of projec- 
tion is introduced ; Many exercises for practice have been 
introduced; Several new problems have been added; The old 
figures have been redrawn, and many of them have been im- 
proved ; Several of the more difficult elementary problems 
have been illustrated by pictorial views; In the treatment of 
curved surfaces, all problems relating to single-curved surfaces 
are taken up first, then those relating to warped surfaces, and 
finally those relating to surfaces of revolution. Experience 
proves this order to be a logical one, as the procedure is from 
the simple to the more complex. Also the student is more 
quickly prepared for work on intersections and developments. 
AMERICAN BOOK COMPANY 
