A. Fuel tank - Contains fuel to operate burner.

B. PREHEATER - Heats generator, which will then change fuel to gas vapor.

C. PREHEATER SHIELD - Helps generator heat up faster.

D. GENERATOR - Filters and converts liquid fuel into gas vapor.

E. BURNER - Spreads out the flame under cooking pots or pans.

F. SPARE GENERATOR - Replacement for defective generator.

G. AIR SHUTTER - Adjusts air input to burner.

H. FUEL FILLER - Provides an opening to place fuel in the unit.

Figure 2-10. - Location and description of burner major components.

These facilities include cesspools, septic tanks, tile fields, and field-type latrines. Information on each of these facilities is provided below.

Cesspools

Leaching cesspools are usually dry-laid masonry or brick-lined wells without masonry at the bottom; the sewage flows into them and leaches out into the soil. Floating solids collect at the top and settling solids collect at the bottom of the well. The leaching capacity of the well is exhausted when the solids accumulate and clog the soil (fig. 2-12). The use of chemicals is not recommended for increasing the useful life of a cesspool.

When the first cesspool becomes filled, a second well may be constructed to take the overflow from the first. In such cases, the first cesspool should operate as a septic tank to collect the settling and floating solids and provide a trapped outlet on the connection leading to the next leaching cesspool. Septic tanks can be placed advantageously ahead of leaching cesspools in larger installations. Leaching cesspools should not be placed closer together than 20 feet by out-to-out measurement of the walls.

Leaching cesspools should be used only where the subsoil is porous to a depth of at least 8 or 10 feet and where the groundwater is below this elevation. When cesspools are located in fine sand, the leaching area can be increased by surrounding the walls with graded gravel.

The number and the size of cesspools required depend on the quantity of sewage and the leaching characteristics of the total exterior percolating area above the groundwater table, including bottoms and sidewalls below the maximum-flow lines. The allowable rate of sewage application per square foot per 2-17