D. VAJSr JSrOSTEAITD. 37 



Van Buren's Formiilas. 



8vo. Cloth. $3.00. 



INVESTIGATIONS OF FOEMULAS, for the Strength of the 

 Iron Parts of Steam Machinery. By J. D. Van Buhkn, Jr., 0. E. 

 Illustrated. 



This is an analytical discussion of the formula; employed by mechanical 

 engineers in determining the rupturing or crippling pressure in the different 

 parts of a machine. The formulse are founded upon the principle, that the 

 different parts of a machine should be equally strong, and are developed in 

 reference to the ultimate strength of the material in order to leave tho choica 

 of a factor of safety to the judgment of the designer.— SiWrream'* Journal. 



Joynson on Machine Gearing. 



8vo. Cloth. $2.00. 



THE MECHANIC'S AND STUDENT'S GUIDE in the Design- 

 ing and Construction of General Machine Gearing, as Eccentrics, 

 Screws, Toothed Wheels, etc., and the Drawing of Hectilineal 

 and Curved Surfaces ; with Practical Eules and Details. Edited 

 by Fkancis Hebbebt Joynson. Illustrated with 18 folded 

 plates. 



" The aim of this -work is to be a guide to mechanics in the designing and 

 construction of general machine-gearing. This design it -well fulfils, being 

 plainly and sensibly written, and profusely illustrated." — Sunday Times, 



Barnard's Report, Paris Exposition, 



1867. 



Illustrated. 8vo. Cloth. $5.00. 



BEPOET ON MACHINEET AND PEOCESSES ON THE 

 INDUSTEIAL AETS AND APPAEATUS OF THE EXACT 

 SCIENCES. By F. A. P. Babnaed, 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 Beport of the Government. It 

 is the most exhaustive treatise upon modem inventions that has appeared 

 eince the Universafl Exhibition of 1851, and we doubt if anything equal to it 

 baa appeared this century."— fAwrno! Applied Che/mislry. 



