CATALOG OF THE MECHANICAL COLLECTIONS 123 



STEVENS ROCKING GRATE BAR, 1879 



U.S.N.M. no. 309217 ; original patent model ; transferred from the United States 

 Patent Office; not illustrated. 



This model was submitted with the application for the patent 

 issued to Francis B. Stevens, November 11, 1879, no. 221430. 



The model represents a grate surface formed of ordinary fish- 

 bellied grate bars on each of the lower ends of which two journal 

 bearings are formed that fit into and rest in two corresponding 

 rounded socket bearings. The bar is made to rock in each of these 

 bearings alternately to the right and left, so that the upper part of 

 the grate overhangs the right-hand socket when rocked to the right, 

 and the left-hand socket when rocked to the left. That the upper 

 part of the grate bar will overhang the center on which it turns is 

 the improvement claimed by the inventor. 



REXFORD FIRE GRATE, 1883 



U.S.N.M. no. 309218 ; original patent model ; transferred from the United States 

 Patent Office ; not illustrated. 



This model was submitted with the application for the patent 

 issued to Philander Kexford, of Syracuse, N. Y., August 14, 1883, no. 

 283144. 



The model represents a furnace grate made up of long grate bars, 

 which are pivoted midway of their depth and have projecting from 

 the upper part of one side of each bar a series of teeth or ribs. Wlien 

 in their normal positions the bars stand obliquely and the smooth 

 solid back of one bar and the ribbed face of the next form the two 

 sides of a trough across the grate. The solid portion is designed 

 to support very fine coal, while the ribbed portion permits the passage 

 of air for combustion. 



RAY OIL BURNER, 1914 

 U.S.N.M. no. 311161 ; original ; gift of the Ray Oil Burner Co. ; not illustrated. 



Tliis is a horizontal, rotary oil burner and is of the first type manu- 

 factured under the patents of William K. Eay. Its essential element 

 is a rapidly revolving atomizing cup that breaks the oil into minute 

 particles by centrifugal force and discharges them from the rim of 

 the cup directly into a stream of air from a fan built into the burner. 

 The cup, which is of brass and about an inch inside diameter, is 

 turned at high speed by an electric motor. Oil enters the cup from 

 a small stationary pipe led into the center of the cup through the 

 hollow cup shaft. A fan is mounted on the same shaft and enclosed 

 in a flat circular housing to which the motor and various parts of 

 the burner are attached and which is hinged so that the entire unit 

 swings away from the furnace door for inspection or adjustment. 



