Word: nitric
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Etchings, printed from copper plates in which a design, drawn by the artist, has been dug out by the corrosive action of nitric acid. He starts by giving his copper plate a coat of beeswax, scratching his design in the soft wax with a needle. Copper, exposed where the wax has been scratched away, is then eaten away by acid. Parts still covered with beeswax remain uneaten. When the acid bath is over, remaining wax is rubbed off and plate is ready for printing. In Drypoints, which look like etchings to the uninitiated, the artist scratches his design right...
...manufacturers last week agreed to drop mercury from the process of making felt hats. A substitute, hydrogen peroxide and nitric acid, will be used. Thus ends one of the oldest industrial hazards, which still causes dangerous nerve disorders among 10% of 22,000 U.S. hat workers. The agreement will soon be sent to various State Legislatures for enactment into...
Chemicals: Ammonia and ammonium compounds, chlorine, dimethylaniline (for explosives), diphenylamine (for smokeless powder), nitric acid, nitrates, nitrocellulose, soda lime, sodium acetate, strontium chemicals (for explosives), sulfuric acid...
...stainless steel, foundry engineers had to tax their wits to meet the technical requirements. Into nine synthetic sand molds made from the plaster model, ten tons of molten stainless steel (temperature 3,000° F.) were poured. When the steel had cooled, four hundred gallons of ammonia and nitric acid, 3,000 gallons of boiling water, were sloshed over its surface to shine it. Said William H. Eisenman, secretary of the American Society for Metals: "It is easily the outstanding achievement of the decade in American foundry practice, probably an all-time high...
...P.E.T.N." is the short name for pentaerythritoltetranitrate, an explosive made from formaldehyde, acetaldehyde, nitric acid. It appeared as a laboratory curiosity during World War I, is no more destructive than standard military explosives, but has the great advantage that no glycerin is needed to make it. In Cincinnati it was reported that Germany, which is short of glycerin, is using P.E.T.N., if not for military purposes, at least for industrial uses, and so releases more of the glycerine explosives for use in shells, bombs, torpedoes, mines, depth charges...