12 Farmers’ Bulletin 1282. 
and have a hopper capacity of 6 or 8 pounds of dust. Most of 
them are carried resting against the abdomen, with straps over the 
shoulders. The retail price of these machines is from $15 to $25 
each. 
HORSE-DRAWN DUSTERS. 
The one-horse duster is a new type developed in the South in re- 
sponse to the demand for a machine intermediate between the hand 
and power outfits for use in combating the boll weevil. Many farmers 
had acreages too large to be economically covered by hand machines, 
yet too small to warrant the expense of a power outfit. The situation 
has been the same in the development of methods of applying nico- 
tine dust; i. e., there has been a demand for an inexpensive, inter- 
mediate machine which will cover up to 10 acres a day, and can be 
operated by a horse and one man. ‘The essential features of these ma- 
chines are: A large hopper with a capacity of 50 to 60 pounds of dust, 
a positive and easily regulated dust-feeding device, a high-speed fan, 
and a set of discharge pipes to deliver the dust to two rows of plants. 
A single traction wheel runs between the rows, and through a series 
of gears supplies power to operate the revolving fan. A clutch on the 
main shaft of the wheel permits it to be released so that all working 
parts of the machine stop when it is being moved to or from the field. 
Recent tests with the one-horse duster in applying nicotine dust 
to truck crops indicate that it is very well adapted to such work, 
but the machine must have a feeding device capable of delivering 
up to 60 or 75 pounds of dust per acre. Figures 7, 8, and 9 show 
one of these machines being used against the pea aphis. Crops like 
cabbage and peas can be gone over with such a duster at the rate of 
from 10 to 15 acres a day. The one-horse duster retails at from $100 
to $150. 
A larger machine having two wheels and drawn by two horses 
operates on the same principle, but is capable of covering almost 
double the acreage. This machine has not been used for nicotine 
dusting, but should be suitable for an acreage larger than that coy- 
ered by the one-horse duster, and where the power outfit is not 
desired. These machines retail at from $250 up. 
POWER DUSTERS. 
The power duster, while used more extensively on fruit trees, is 
well adapted to truck crops. In the machine commonly used, the 
hopper holds about 100 pounds of dust. A mechanical and easily 
regulated device allows the desired amount of dust to feed into the 
discharge pipe through which the air is blown from a rapidly re- 
volving fan. The latter is attached by means of a belt to a 
2 -horsepower gasoline engine. For certain occasions the single large 
—— 
