Hand Hole

—1. An opening large enough to readily admit the hand, provided in an underground conduit for the purpose of gaining acce to the cable. 2. In a steam boiler, a small opening in the outer firebox or shell, large enough to admit the hand and arm; it is closed with a small oval door, jointed on the inside, and held in position by a dog and bolt, similar to the larger manhole of a boiler.