CALIBRATION

14. A depth charge pistol, which does not fire at a pressure within the allowed tolerance when the index pointer is set at the 100-foot mark, may be calibrated if the error does not exceed the tolerance by more than 5 pounds per square inch. If the error is greater than this, overhaul of the pistol will probably be necessary.

5. Calibration of the pistol is made possible by the slots in the index pointer carrier which permit rotation of the pointer with respect to the depth-setting sleeve.