Evening Republican, Volume 21, Number 276, Rensselaer, Jasper County, 25 November 1918 — Sensitive Instruments. [ARTICLE]

Sensitive Instruments.

There are instruments made by the hands of men which surpass the eye in keenness and rival the nose. The spectroscope is generally considered one of the most perfect instruments, ft will detect the presence of one-hundred-millionth of an ounce of sodium. The electroscope, however, is more than a million times more sensitive than the spectroscope, and will detect one thirty-five-thousand-bll-tlonth of an ounce of radium, or one millionth of a millionth of a milligramme! The bolometer will register the heat of a candle a mile and a half distant * ,