These 1942 lessons were prepared under the direction of the Commanding General, Field Artillery Replacement Training Center, Fort Sill and prescribed for use as an aid to training.
These instructions are published for information and guidance of personnel responsible for organizational maintenance of the computer, gun direction M18.
Searchlights may be classified broadly as Coast Defense Searchlights (used normally against naval targets) and Antiaircraft Searchlights (used normally against aircraft).