Word: tracers
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...inland march into uptown Seattle warehouses: "We always used indoor bats with about four inches sawed off so we could hide them in the sleeves of our coats. We had to use bats because the longshoremen fought with their cargo hooks.* Sailors used a two-foot length of tracer chain, or wrapped window-sash chain around their fists...
Radioactive tracers, which have revolutionized medical and biological research, are now going to work in industry. This week Arthur D. Little, Inc. of Cambridge, Mass, told how it used the tracer technique to solve a steel problem...
...types of sulphur in coal: organic and "pyritic" (iron sulphide). Republic Steel Corp. wanted to know whether either type is driven off when the coal is made into coke. There was no handy chemical way to find out, but the Little Co.'s scientists worked out a tracer technique that did the job quickly and easily...
Radioactive Tracer. The most spectacular test used radioactivity. A little of the unknown synthetic which the chemists hoped was penicillin was made up with radioactive sulphur built into its molecule. Mixed with natural penicillin, it was put through recrystallizations and chemical transformations...
...Kurt Lange and David Weiner of the New York Medical College got the idea while studying blood circulation by means of fluorescein, a tracer dye which, injected into the blood, flows freely with it and glows yellow-green under long-wave ultraviolet light. When they froze rabbit tissues (and later that of human volunteers) they found that after a time the whole frozen area glowed brightly, indicating blood concentration...