Fahrenheit's zeal never slackened For years FaTircnlieil attempted to construct a practical
The rest is history. Fahrenheit's mercury thermometer,
thermometer :so lit at he could with his . . . "own eyes per-
perfected in 1714, and his scale of temperatures are in
ceive this beautifu 1 phenomenon of nature" . . . that water
common use throughout the English speaking \vorld. Mallinckrodt Mercurials have far reaching uses. Over
hoils at a fixed lie^at. His zeal never slackened. And for yesirs tXie efforts of the instrument maker were
thirty compounds are manufactured in accordance with the
in vain until he remembered that the column of mercury
Mallinckrodt tradition of purity, uniformity* and dependa-
in a harometer was "a little altered by the varying temper-
bility. These compounds include Calomel, Corrosive
atures of the mercury. From this I gathered that a ther-
Sublimate, Mercury Iodide, Nitrate, Oleate, Oxide and
mometer could he constructed of mercury. . . ."
other various mercuric and mercurous salts.
CHEMICAL WORKS
MALLINCKRODT SO Weate
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Mallinckrodt Street, St· Louis 7, M o . · CHICAGO
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ANGELES
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