780 Transactions of the American Institute. 



Bkick and Tile Machine. 

 Mr. Tlios. J. Cornell exhibited a brick and spoke of a new brick 

 and tile machine which had taken the prize at the Institute fair. 



Mr. J. B. Lyman asked the price of the machine, and stated that 

 if a machine could be gotten up at $000 there would be a large sale 

 for it at the west for making drainage tiles. 



Mr. T. J. Cornell stated the price of their machine is $1,500, but 

 tliought arrangements might be made to afford it at less. 



Adjourned. 



April 19, 187 , 



Nathan C. Ely, Esq., in the chair; Mr. Johx W. CiiAiiBEns, Secretary. 

 Rocks in Fields. 



Mr. E. iN". Dwyer, E"orth Bennington, Yt. — I have in my field a 

 great number of boulder rocks, and would be glad if the Club could 

 tell me some cheap and easy mode of getting rid of them. They are 

 very hard, so that the best drill makes but little impression. Would 

 gun-cotton be better than powder ? 



Mr. R. J. Dodge. — I have heard of nitro-glycerino being used in 

 similar cases. 



The Chairman. — This substance has been used with great effect in 

 the East river. For some reason its use has been discontinued, but, 

 I have heard it is to be resumed. It is a very powerful and effectual 

 explosive material. 



Dr. Isaac P. Trimble. — The old-fashioned way to get rid of 

 boulders was to build a tire around them, and, when sufficiently 

 heated, pour water on them, and they would crumble to pieces. 

 Nitro-glycerine was a dangerous stuff to handle, and he would not 

 advise any farmer to use it. 



Mr. II. L, Reade. — I would like to know wliat is the theory of 

 blasting rocks under water ; whether the immense weight af water 

 forced the power of the blast against the rock. 



Chairman. — I suppose such is the theory, as in -the Hell Gate ope- 

 rations tliey merely laid the explosive material on the rock. 



Feeding Catfle Gkeen Cokn Foddek. 

 The same correspendent said : I feed my cattle green corn stalks 

 and fodder, and they eat them cue or two days, and then nothing 



