Gasoline-Heated Brooder-House. 207 



They are made of 2 x 12 inch stock and are cut eight feet long with a 

 bevel at each end to form runners or shoes upon which to draw the house 

 about when desired. 



An opening of 8}i inches by 12 A inches is cut in the rear runner 

 to admit the burner box. (Plate H, Fig. 2.) The top of this opening 

 is one and one-half inches from the top of the runner and has a one-half 

 inch slit sawed into the runner horizontally from the two upper corners 

 for the purpose of admitting the flange, or projection, of the upper edge 

 of the burner box. A piece is cut from the runner directly over the 

 center of this opening to admit the collar, which is on top of the burner 

 box. The piece is sawed out on a mitre so that it can be replaced and 

 secured by a single screw. (Plate H, Fig. i.) The opening made by 

 removing this piece is five inches in the clear. 



A strip one inch square and 18 inches long is nailed to the inside of 

 the runner one inch below the lower edge of the opening for supporting 

 the rear end of the insulating box. (Plate HI, Fig. i.) 



The floor joists, four in number, are made of 2 x 4 inch stock, cut 

 eight feet long, and are fitted into the runners with a half joint. (Plate 

 HI, Fig. 2.) This gives a strong sub-frame that is not likely to get 

 out of square when drawn over uneven ground. After fitting the joists 

 into the runners and securely nailing with 2od nails, the work is leveled, 

 squared, and tied by means of a one inch board nailed diagonally across 

 the joists. 



The support for the burner box is then put in. (Plate H, Fig. i.) 

 It is made of three pieces of 2 x 4 spiked to the rear runner and to 

 the two center joists. It is placed flush with the top of the joists and 

 runner so that the flooring can be nailed to it. The inside dimensions 

 13^. x 24^/2 inches are such as to allow the flange of the burner box to 

 slide in easily. The flange rests on J^ x i inch strips which are nailed 

 I A of an inch below the top of the 2 x 4's forming the support. (Plate 

 II. Fig. T.) This leaves a space of one and one-half inches between the 

 top of the burner box and the floor of the house which prevents the 

 floor from becoming too warm and serves as a chamber in which to warm 

 the fresh air that is admitted for ventilating the hover. The cool fresh 

 air is taken from beneath the house through four one inch holes, bored 

 in the 2x4 supports. (Plate II, Fig. i, and Plate IV, Fig. 2.) It 

 is warmed by passing over the metal top of the burner box and as it 

 expands is forced upward around the stem and down upon the chicks. 



The insulating box is made of seven-eighths inch matched pine floor- 

 ing and is supported at the rear by resting on the strip at the bottom of 

 the runner and in front by hooks and eyes, such as are used for screen 

 doors, to the support. (Plate HI, Fig. i, and Plate IV, Fig. 2.) 



