Word: silver
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Dates: during 1920-1929
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Negatives at that time were made on wet plates, a sheet of glass covered with collodion and silver nitrate (sensitive to light) a few minutes before exposure. George Eastman, no scientist himself, tried empirically to invent dry plates covered with silver nitrate and gelatine. After trials and troubles which a thorough knowledge of colloidal chemistry, as he later learned, might have prevented, he succeeded in this effort...
...That copper amalgam fillings, so often used in filling children's teeth, constitute the greatest source of danger, but silver and gold amalgams have also found their victims...
...engaged Engineer Hoover one summer to prospect in the Alps for the iron old Romans must have used for their swords.* Engineer Hoover and his brother, Theodore Jesse Hoover (who lives in Swanton, Calif.), perfected and installed a method for recovering zinc from the dumps of Australian lead and silver mines. In Burma, Engineer Hoover bought an abandoned mine and transformed it into one of the world's largest, employing 20,000 men. In 1914, he had the choice of selling out this property or becoming a British citizen. He sold, refusing also a title and a British Cabinet...
...United States Army ought to come over here and clean it up!" Mr. Tinker boasted how much finer his home town was than oldtime Timgad. Mr. Tinker rode through Africa on a camel, like a barbaric Roman potentate, "raining money like some great careless thundercloud charged with silver and gold and pouring them down...
...Bremen, a silver flash in the air, is a low-winged, single-motored Junkers machine similar to those used in passenger and freight service on the Lufthansa lines. She has a 310 h.p. motor and cruises best at a speed of 95 to 100 miles an hour...