PROCEEDINGS OF THE POLYTECHNIC ASSOCIATION. 489 



Mr. Bartlett. — It is impracticable to use steam at the full 

 stroke ; four-fifths was the general point at which steam was cut 

 oif. All those that speak of the use of steam expansively 

 say you must have a cylinder large enough for that purpose. 

 Mr. Isherwood insists that the experiment of the two cylinders 

 is the most perfect. 



Mr. Humphries. — Experiments must be made on one cylinder, 

 and one only. 



Mr. Charles Wright said he had twenty years experience in this 

 business, and his opinion was, that a single cylinder was, in every 

 way, advantageous, both in its first construction and after use, 



Mr. Yance requested the attention of the committee to an 

 engine in use at his works at the corner of Twenty-fourth street 

 and Tenth avenue. 



Mr. Eisher moved that a committee be appointed to examine 

 a steam carriage that he had in construction. 



The Chairman appointed Messrs. Sykes, Haskell and Yance as 

 a committee for that purpose. 



Mr. Garvey moved that the subject of the "Great Eastei'n" and 

 *' steam cut-offs " be brought up for discussion at the next 

 meeting. 



Adjourned to the second Thursday of September, at 8 o'clock 

 P. M. 



American Institute, Polytechnic Association, ) 

 September 13, 1860. \ 

 Prof Mason in the chair. 



CUT-OFFS. 



Mr. Rowell. — On the Chancellor Livingston they had an 

 arrangement by which they could vary the half stroke to the full 

 stroke, and he requested of Mr. Walker, the chief engineer, to be 

 allowed to make an experiment on board of her, which request 

 was granted, but on account of the shortness of the trip they 

 concluded not to do so. 



Prof Mason stated that at a future meeting a report might be 

 expected from the superintendent of the New Jersey railroad, of 

 experiments which were made on that road, upon the application 

 of electricity to the periphery of the driving wheels of locomo- 

 tives, in order to increase the traction of the engines and pre- 

 vent the wheels from slipping when drawing heavy loads up 



