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The first successful tunnelling shield was developed by Sir Marc Isambard Brunel to excavate the Thames Tunnel in 1825. However, this was only the invention of the shield concept and did not involve the construction of a complete tunnel boring machine, the digging still having to be accomplished by the then standard excavation methods.
Although, at first glance, muskeg resembles a plain covered with short grasses, a closer look reveals a bizarre and almost unearthly landscape. Small stands of stunted (often-dead) trees, which vaguely resemble natural bonsai, grow where land protrudes above the water table, with small pools of water (stained dark red) scattered about.
In contemporary spacecraft, ablative plating is most frequently seen as an ablative heat shield for a vehicle that must enter atmosphere from orbit, such as on nuclear warheads, or space vehicles like the Mars Pathfinder probe. A large amount of developmental usage was on the early 1960s rocket powered X-15 crewed aircraft traveling at ...
The Genoese crossbowmen, an internationally-recognized elite corps, made use of the pavise, utilizing pavesarii (shield bearers). Having over three crossbowmen per pavise suggests that they took turns using the pavise as cover and were used primarily in static or defensive formations.
It’s that time of the year again … time for a Festivus for the rest of us! This Monday, Dec. 23 is a time for family, food and the annual Airing of Grievances during Festivus, the alternative ...
The chuckmuck is constructed from a stiff leather purse with a thick curved steel striker attached by rivets to its base. The sides and flap of the purse are either sewn or fixed by ornamental metal plates or small plaques.
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Tiger Woods’ return to the golf course will have to wait a little longer. The 15-time major winner announced Monday afternoon that he will not be playing in the Hero World Challenge, his annual ...