1). VAN NO STRAND. 
37 
Van Buren’s Fornmlas. 
8vo. Cloth. $2,00. 
INVESTIGATION8 OF FOEMULAS, for the Strength of the 
Iron Parts of Steam Machinery. By J. D. Van Buken, Jr., 0. E. 
Illustrated. 
This is an analytioal discussion of the formul® employed hy mechanical 
engineers in determining the rupturing or crippling pressure in the different 
parts of a machine. The formul® are founded upon the prmciple, that the 
different parts of a machine should be equally strong, and are developed m 
referenee to the ultimate strength of the material in order to lcave the choic« 
of a factor of safety to the judgment of the designer. -Sühman s Journal. 
Joynson on Machine Gearing. 
8vo. Cloth. $2.00. 
THE MECHANIC’S AND STUDENT’S GUIDE in the Design- 
ing and Construction of General Mactime Gearing, as Eccentrics, 
Screws, Toothed Wheels, etc., and the Drawing of Eectilineal 
and Curved Surfaces ; with Practical Eules and Details. Edited 
by Francis Herbert Joynson. Illustrated with 18 folded 
plates. 
“ The aim of this work is to be a guide to mechanios in the designing and 
construction of general machine-gearing. This design it well fulfils, bemg 
plainly and sensibly written, and profusely illustrated.”— ‘unday limet. 
BarnarcTs Report, Paris Exposition, 
1867. 
Illustrated. 8vo. Cloth. $5.00. 
EEPOET ON MAOHINEEY AND PEOCESSES ON THE 
INDUSTEIAL AETS AND APPAEATUS OF THE EXACT 
SCIENCES. By F. A. P. Barnard, LL.D.—Paris Universal 
Exposition, 1867. 
« We have in this volume the results of Dr. Barnard's study of the Paris 
Exposition of 1867, in the form of an official Report of the Government. It 
is the most exhaustive treatise upon modern inventions that has appeared 
since the Universal Exhibition of 1831, and we doubt if anything equal to it 
has appeared this Century.”—Journal Applied Chemistry.