Word: shale
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Dates: during 1930-1939
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...bore a hole 500 ft. deep, drop a dynamite charge to the bottom. When the charge is exploded, vibrations resembling earthquake waves ripple out in all directions. Some travel straight down, and part of them are reflected back up with different intensities from layers of rock, sandstone, limestone, shale. Geophones on the surface pick up these reflected waves, and from the time intervals the prospecting engineers can tell how far down the different layers are beneath various points on the surface. If by this means they can plot something that looks like an oil dome, they indicate the probability...
Marquis has, after all, a wonderful ability for characterization. No matter with whom he is dealing he does so sympathetically. Mister Splain, a village drunk, a backslider, chicken thief; Cherry Saltus, the stupid, over-sexed girl who turns the town upside down by her adventures; Jim Shale, the grave-digger who is guilty of being an unconfessed free-thinker--these people the author neither reproaches nor encourages. He merely shows them to you as he understands them, with all the power of his insight...
...flotation method of separating ores from waste, using liquids of higher specific gravity than water, has been used for nearly a century. For over three decades E. I. du Pont de Nemours & Co. has been trying to devise an economical flotation method for separating impurities such as shale and slate from low-grade anthracite coal. For "parting liquids," they needed mixtures of controllable specific gravity up to three times that of water. Pentachlorethane and tetrabromethane filled this bill-after the Du Pont men worked out a way to use them over & over again cheaply...
...fold machine which gave spare-time academic work to students, part-time public work to vagrants. Across the U. S., youth won wages and self-confidence as they catalogued, filed, checked records, cleared parks and playgrounds, plowed, harrowed, reaped, graded, dumped, filled, drained, made heavy-duty roads and blue-shale tennis courts, built dairy barns and country schools, feed houses and flop houses, stitched, cooked, nursed, painted, studied, bought their board & keep and sent a little something home...
...first trip to points of prehistoric interest will meet at 2 o'clock Saturday at Washington Heights, Brighton. There Laurence La Forge '99 will examine the conglomerate, shale, sandstone, and volcanic rocks and will point out the main features of the Boston Basin from the hill...