Automatic Cut-off Device for a Gas Fired Laboratory Mercury Still.

Abstract

This device has been used continuously day and night for several months, interrupting the operation only over week ends, with only a very occasional failure, which has invariably been due to the battery running down. This device may readily be adapted to the control of vacuum distillations and other work in which a constant vacuum is desired.Bureau op Chemistry and Soils Ward E. KuEntzBl Fertilizer and Fixed Nitrogen Investigations Department op Agriculture Washington, D. C.

The First 110 Years of Laboratory Automation: Technologies, Applications, and the Creative Scientist

“…Most of these were constructed by chemists and were not offered by equipment manufactures. [15][16][17] During the 1920s, we also see specialized devices used for solvent extractions in botanical research. Palkin et al 18 in 1925 created continuous liquid-liquid extractors with internal diffusers so that the extraction solvent would be "sprayed" through the aqueous phase.…”

“…Most of these were constructed by chemists and were not offered by equipment manufactures. [15][16][17]…”