REPORTS OF COMMITIEES 



ON MANUFACTURES, SCIENCE AND ART. 



Report on JVcer^s Dynamometer. 



The Committee on Manufactures, Science and Art, respectfully 

 report : 



That they have examined a model of Neer's Dynamometer and 

 Register, and are of opinion, that when properly constructed and 

 graduated, it cannot fail to measure and register the pressure and 

 velocity communicated to a revolving shaft, to which it may be 

 adapted, from a steam engine or other prime mover; and that it 

 will therefore furnish an estimate in horse power or any other 

 conventional unit of force, the amount of power derived and 

 expended. It is unnecessary that the committee should enlarge 

 upon the practical utility and importance of an instrument by 

 which the objects above stated can be obtained. 



JAMES RENWICK, 

 EDWARD W. SERRELL, 

 BENJAMIN GARVEY, 



Committee. 

 New York, July 2, 1860. 



Emery Vulcanite. 



The Committee on Manufactures, Science and Art, respectfully 

 report : 



That the committee have examined the Emery Vulcanite with 

 a view to comparing it with other abrading substances used in 

 the arts, particularly in the arts Avhere metals are operated upon, 

 and that they have found it to possess some important properties 

 which render it superior to the other substances employed for 

 making, grinding and polishing, when finishing files, scythes rifles 

 and other like articles. 



