The distinguishing feature of a breast drill is the breast plate at the opposite end from But this one doesn't use a conventional bevel gear, and has four speeds.
Breast Drill: A hand operated drill with a pad on the end which can be place against the chest to increase the force applied. The drill operates through a wheel.
The advantage of an attachment of this kind for use in connection with a breast drill is obvious. Most of the work done by a tool of this character.
Visko drills are generally powered by hand cranks, and they have a breastplate which allows the operator to lean over the drill and bear down with his weight.
Breast drills are not to be confused with hand drills. Hand drills are generally fifteen inches or less in length, are best suited for drilling holes in wood and light.