air drill

air drill (plural air drills)

1. A drill driven by the elastic pressure of condensed air; a pneumatic drill.

• Edward H[enry] Knight (1877) “Air drill”, in Knight’s American Mechanical Dictionary. […], volumes I (A–GAS), New York, N.Y.: Hurd and Houghton […], →OCLC.
• “air drill”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.