miner's friend

miner's friend

[′mīn·ərz ′frend]
(mining engineering)
The Davy safety lamp.
A steam engine once used to pump water from underground.
References in periodicals archive ?
Savery's patent, called "The Miner's Friend," was for a water pump that functioned by admitting steam to a chamber, condensing it by cooling the outside of the chamber, allowing the partial vacuum to siphon water into the vessel, and then lifting the water with steam pressure.
Savery built such pumps in 1698 and called them the Miner's Friend. A few even came to be used.
Savery's Miner's Friend was too inefficient and too dangerous.