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Excerpt from Directions for Meteorological Observations, and the Registry of Periodical Phenomena, 1860
Placing - Place the thermometer in the Open air, and in an Open space, out of the vicinity of high buildings, or of any oh stacle that impedes the free circulation of the air. It should be so situated as to face the north, to be always in the shade, and be at least from nine to twelve inches from the walls of the build ing, and from every other neighboring object. The height from the ground maybe from ten to fifteen feet, and, as far as possible, it should be the same at all the stations. The instrument should be protected against its own radiation to the sky, and against the light re¿ected by neighboring objects, such as buildings, the ground itself, and sheltered from the rain, snow, and hail. The following arrangement will fulfil these requirements (fig. 1)
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