. Fig. 2. mercury indicating the temperature on the scale, as shown in Fig. 3. A simpler form of instrument is constructed for ordinary ship's use. Sir William Siemens' Electric Thermometer is a very delicate instrument, by which the Temperature is recorded on deck at any depth desired. We cannot attempt to describe this, it being only suitable for scientific purposes. The following illustration has appeared in many previous editions of this work, and, although the instrument is old-fashioned, its principle is good for small depth observations, such as those required by fisherme
. Fig. 2. mercury indicating the temperature on the scale, as shown in Fig. 3. A simpler form of instrument is constructed for ordinary ship's use. Sir William Siemens' Electric Thermometer is a very delicate instrument, by which the Temperature is recorded on deck at any depth desired. We cannot attempt to describe this, it being only suitable for scientific purposes. The following illustration has appeared in many previous editions of this work, and, although the instrument is old-fashioned, its principle is good for small depth observations, such as those required by fishermen. Captain Livingston says:—"In my thermometric experiments I had several thermometers broken. However, to secure my thermometers from being broken, and to enable me to have a column of water round tha
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