432 TRANSACTIONS OF THE AMERICAN INSTITUTE. 



off freely through the gauze, and is burnt on the other side. One 

 thii'd more heat is secured by this process than by any other. 

 The wire cloth used here is No. 11. The fire-box is about two- 

 thirds of the way down, and just behind the grate are passages for 

 air which passed through a cylinder that has a partition. There 

 is an upper draft on the flame. The stove can be seen at No. 11 

 Chamber street. 



Mr. Frank Dibbin thought the u*e of fire-brick would answer 

 the same purpose as the wire gauze, if not a better. 



Mr. J. Hirsh did not see how a stove could give out any heat, 

 the fire of which would not burn the wire gauze placed within two 

 inches of the flame. 



Ml-. J. Wyatt Reid said that some years ago he drilled holes in 

 the fire doors of boilers, which made the combustion much better. 

 He noticed that before doing this the top of the fire was a cherry 

 red, and when the holes were made a blue flame appeared, show- 

 ing that more oxygen was admitted. 



Dr. Rowel 1 remarked that a series of experiments were much 

 wanted in regard to combustion. There have not been any experi- 

 ments made in regard to heating certain spaces. The house he 

 lived in and one around the corner, were the same in size and 

 built alike in every respect, yet he burned but five tons of coal 

 during the winter, while his neighbor burned twent}'-, having just 

 the same spaces to heat. 



Mr. S. II. Maynard said there would be a portion of water 

 formed by the combustion of the gases in this stove; if there v/as 

 an ordinary draft it would be carried up the chimney, but if not 

 it would be deposited on the metal, which must soon be consumed. 



Rock Drilling INIachine. 

 Mr. Walter Hyde exhibited a model of his rock drilling machine. 

 The main novelty in this machine is the suspending of the drill 

 from a rope, which causes the drill to turn at every blow, thus 

 enabling him to use a drill only thirty feet long for any depth of 

 boring He had drilled 1900 feet ; much of it through lime rock, 

 and could do the same through quartz rock. When a drill is 

 thirty feet long, it will cut just as well as if eighty feet in length, 

 for when it is of great length the weight of the drill can hardly 

 come upon the rock before it is raised up. For a four inch hole 

 the drill will weigh about 400 pounds. His oil-well boring 

 machine complete, is sold at 1,000 dollai'B. 



