Word: lensed
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Dates: during 1940-1949
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They went virtually intact, and without pressure, toward positions along the Escaut River in front of Ghent, Lille, Lens.
Last week, Astrophysicist Donald Howard Menzel of Harvard announced construction plans for the world's highest astronomical station to house the first U. S. coronagraph. Site of the new observatory is Climax, Colo., a hamlet of 1,500 souls, perched 11,300 feet high on a pass of the...
The principle of the coronagraph (which resembles an anti-aircraft gun-see cut) is simple. A metal disc is placed at the focus of the telescope lens to cut out the bright sun image. A second lens focuses on photographic film the black disc and flaring corona, and a powerful...
There are only four makers of military optical instruments in the U. S. One is Kollmorgen (of Brooklyn), which concentrates on periscopes. Another is Keuffel & Esser (of Hoboken, N. J.), which makes range finders, trench periscopes. A third is Spencer-Lens Co., scientific instrument subsidiary of American Optical Co. The...
. . . Last wide military use of shrapnel against troops was not in the Boer War, 1899-1902, as many Canadian soldiers could testify who came under extensive and persistent shrapnel shelling at Ypres, 1915, 1916, 1917; on the Somme, 1916; at Vimy and in front of Lens, 1916, 1917; before Arras...