6-29. MODIFIED M-1937 HEATER
a. Description. Modification of the heating unit from an M-1937 field range will
permit its use to heat water for washing messkits. One heating unit can then be made
to do the work of three. This modification consists of using a U-shaped pipe as shown
in figure 6-23. The M-1937 heating unit is connected to the pipe by suitable fittings. At
intervals of from 36 to 48 inches (sufficient to permit the cans of wash water to be set
over them), three very small holes are drilled in the lower pipe. These holes should be
about the size of a bristle in a wire brush. It is also important to provide perforated
shields around the holes as shown. The shields can easily be made from number two
size tin cans.
Figure 6-23. Modified M-1937 fire unit.