Democratic Sentinel, Volume 19, Number 42, Rensselaer, Jasper County, 25 October 1895 — Deep Sea Thermometers. [ARTICLE]

Deep Sea Thermometers.

Thermometers made for taking the temperature in moderately deep waters havb the tube incased in a copper cylinder to protect it from inquisitive fishes and from contact with rocks; there is a ring at the bottom to which sufficient weights may be attached to sink it readily. The cylinder has a long, narrow door in front of the scale, which may be opened for the reading, and this door closes with joints so tight that the cylinder brings up the water from the bottom with its temperature practically unchanged by the waters through which it passes.