ANIMAL MANURES 
51 
truck farms and there pumped into large reservoirs, 
which are provided with double gates. When loading 
on the wagons, which are backed up to the spouts of the 
reservoirs, the outer gate is first closed and the inner 
gate opened. The space between the two gates holds a 
wagon load. When this space is filled, the inner gate is 
A 
FIG. 10. NIGHT SOIL TANK-WAGON USED NEAR BALTIMORE 
closed and the outer gate opened and the material is then 
conducted into the wagons, provided with tanks that are 
closed tightly when the wagon is in motion. In distribut- 
ing over the field the end gate to the tank is raised by a 
lever operated by the driver, and the watery material is 
then spread over the slanting tail-board. Figure 10 shows 
the style of wagon used on the Patapsco Neck near Balti- 
