Attack by Oiling 169 



These carts are very useful where they can be 

 driven, and save much labor in transpo«ting and 

 applying oil. The illustration shows their con- 

 struction. 



They are especially usefiil in applying heavy 

 coatings of oil to roadside ditches, for inhibiting 

 vegetation, and preventing collapse and erosion. 



They may also be used for transporting oil from 

 the storage tanks to service tanks and drip devices. 



In the jungle covered country of the Canal 

 Zone, there are many places where the lightest of 

 carts cannot penetrate, and yet are accessible to 

 pack animals. These animals carried two fifteen- 

 gallon cylinders of oil fastened to the regulation 

 pack saddle. These little tanks are provided with 

 a two-inch screw stopper for filling, and a one-inch 

 spigot for discharging. The pack mule is especially 

 useful when filling drip barrels situated on streams 

 flowing through the jungle, where only trails can 

 be used. Trails had to be cut for the mtile, but 

 the trouble was repaid. One good mule carried 

 as much oil as six porters on each trip, and in less 

 time. The photograph shows the pack mule 

 which has done valiant service in the cause of 

 sanitation for about five years. The equipment 

 shown is of the simplest type. 



After the oil is sprayed on the water, the 



