MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Using an electric drill. Man with ear protectors and safety glasses using a hammer drill. This is a rotary drill with a hammering action. It is used to drill holes in masonry or stone, and produces a lot of noise. The human ear can be damaged by exposure to high noise levels, so ear protectors are used to reduce the level of sound reaching the man's ears. The safety glasses protect his eyes from flying pieces of debris during the drilling.
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