PROCEEDINGS OF THE POLYTECHNIC ASSOCIATION. 481 



Fourth. The Chairman may invite any person to address the 

 meeting or to participate in the deliberations, but such person 

 not a member shall be announced as a visitor. 



Fifth. Topics presented for consideration, or the announce- 

 ment of a discovery or invention, improvement or novelty, or 

 the exhibition of any machine or part thereof, or any manufac- 

 ture or article, must be preceded by a statement setting forth 

 the point, in writing, to be deliberated upon. 



Sixth. Any person desiring to put on record any supposed 

 or real discovery in science, manufacture, or arts, may address a 

 communication to the chairman of the Association, under seal 

 and properly endorsed, which shall be preserved in the archives 

 of the American Institute as evidence for the party depositing 

 the same. 



Seventh. In all cases not provided for by the rules, Jefferson's 

 Manual shall be taken as a standard. 



Eighth. The official reports of the meetings of the Associa- 

 tion, shall lie upon the desk of the recording secretary until 11 

 o'clock of the day following the meetings, for the inspection of 

 members, and such corrections as are necessary before going to 

 the public press. 



JVinth. The minutes ot the previous meeting shall be read at 

 the opening in order for correction, unless otherwise directed by 

 the meeting." 



GAS BURNING. 



Mr. Johnson produced an old English standard gas burner, and 

 stated that all burners of the same class became very hot after 

 being lighted for a few moments. The heat, half an inch over 

 the glass of one of these burners, was sufficient to make platina 

 red hot. 



Mr. Johnson experimented on a French burner, manufactured 

 in Boston. 



CUT-OFF IN STEAM ENGINES. 



Mr. T. D. Stetson, in opening the regular subject for the eve- 

 ning, " the actual and theoretical gain, in effect due to the use 

 of the ' cut-off' in steam engines," expressed a strong belief that 

 there was a gain in its use, but not as great as the ordinary 

 theory would indicate. Mr. Isherwood, a high authority among 

 steam engineers, and several others, were reported as believing 

 there was no real gain. He hoped to hear the subject thoroughly 

 ventilated here. Nine thousand locomotives, between one and 

 two thousand larger engines on steamboats, and an immense 

 number of stationary engines, were working in this country 

 alone, with more or less elaborate and complicated machinery 



[Am. Inst.] EE 



