20 Farmers’ Bulletin 1169. 
Heat the axle grease in a cooking vessel of at least a gallon capac- 
ity until all the water in it is evaporated. Without removing this 
from the fire, stir in the fish oil, followed by the powdered rosin, a 
little at a time. When the latter is dissolved, remove from the fire, 
and the mixture is ready for use next day. 
PRINTER’S INK. 
Refuse printer’s ink, sold as “tree ink,” may be used for tree- 
banding purposes, but it should be mixed with a heavy oil to pre- 
vent it from drying too rapidly. 
SPRAYING OUTFITS FOR SMALL OPERATIONS.’ 
HAND ATOMIZERS. 
For spraying a few plants or very small trees, hand atomizers 
(fig. 7) may be used. These are made of brass, copper, heavy tin, 
or other material, and usually have a capacity of about 1 quart. 
Fic. 7.—Hand atomizer, useful for spraying small plants or low-growing trees. 
tance and Siegler.) 
SMALL COMPRESSED-AIR PUMPS. 
Compressed-air pumps (fig. 8) are now most frequently used in 
small-scale spraying, and are preferred to the bucket or knapsack 
pumps by those who do not wish to pump while applying the spray. 
These pumps are usually made of brass or galvanized sheet steel and 
have a capacity of 3 to 4 gallons. They are carried by means of a 
shoulder strap. In the better types agitation is provided, usually 
by the entrance of the air at the bottom of the tank. After the spray 
material is poured into the tank, and the opening closed by the tight- 
fitting cap, the air is pumped until the liquid is under pressure. The 
‘tank is usually emptied by three to four pumpings of a dozen strokes 
each. 
7 Adapted from Farmers’ Bulletin 908, 
