4 
THE COLORADO EXPERIMENT STATION 
This bottom was nailed with common six-penny nails to a frame 
made of two-by-fonrs that was 24 x 96 inches in size and being the 
same in length as the sheet of iron, but about six inches nar¬ 
rower, which allowed about three inches to be turned np and 
nailed to the outside of the frame on each side. This made the 
pan more secure. To prevent leakage a strip of tow candle wick- 
ing was nailed beneath the iron between two rows of nails. 
A coat of paint completed a water tight pan 24 inches wide in¬ 
side by eight feet long. To the ends of this pan were bolted sled 
runners four feet long, cut from a piece of 2 x 10 . The runners 
were so placed as to carry the pan about four inches above the 
ground. Fig. 1 shows the general plan of the pan with the 
runners attached, also four small 10 inch cast wheels bolted near 
the ends of the runners, also the dimensions as indicated. The 
wheels support the runners only one and a half inches and steady 
the pan over rough places. They lightened the draft and allowed 
the pan to be drawn over the hay without catching and dragging 
it. By hitching a horse in front of one runner with a short rope 
and with a longer rope from the other runner hitched into the 
hame staple of the harness, the wheels will carry the dozer at right 
angles and entirely to the side of the horse, thus preventing the 
hoppers from being frightened away from in front of the advanc¬ 
ing pan. At the back of the pan is a light frame three feet high 
secured by uprights that are braced in front to the runners. Over 
this frame is stretched a sheet of white table oilcloth with the 
smooth side to the front. Every grasshopper that hits the 
smooth surface of the oil cloth screen falls into the pan which is 
filled with about two inches of water and about a pint of kerosene 
oil on the surface. The lower edge of the oilcloth is nailed with 
strips to the inside of the pan at the back to prevent slopping. 
Plate I. shows the hopperdozer complete ready to hitch to 
and also views of it when in use and the manner of hitching. 
