GREATHEAD SHIELD

Domain	Definition
Mining	A tunneling device invented by J. H. Greathead, first used in London in 1869, and still widely used today. His invention included a circular cutting edge forced through the ground by hydraulic jacks, a cast-iron lining assembled by bolts, and grouting behind the lining with the aid ofcompressed air and a special mixer. (references)
Source: compiled by the editor from various references; see credits.

Anagrams: GREATHEAD SHIELD

Scrabble® Enable2K-Verified Anagrams
	Words within the letters "a-a-d-d-e-e-e-g-h-h-i-l-r-s-t"
	-4 letters: lightheaded.
	-5 letters: deadlights, delighters, desiderata, desiderate, disrelated, headlights, lethargies, redigested, saddletree, trailheads.
Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro.