Instructions to Meteorological Observers in India

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Excerpt from Instructions to Meteorological Observers in India: Being the First Part of the Indian Meteorologist's Vade-MecumLastly, it is not infrequent to find in the registers of temperature published in official reports, not the actual observations, but certain values which are called means.' But it is very rarely stated how these means have been computed. One person reads an ordinary thermometer at 10 A. M. And 44 P. M., and gives the average of the two readings, an other gives the average of his maximum and minimum and in some registers which lately came under my notice, this mean temperature was obtained by adding together the readings of a minimum and maximum thermometer recorded and reset both at 10 A. M. And 4 P. M. And divid ing by four. This really amounted to giving, as the mean temperature of the day, the average of the highest and lowest temperatures, of 10 in the morning and of 4. O'clock' of the previous afternoon. The proper meaning of the term mean will be explained further on, but it is clear that the results of the above three methods will all be different, and, indeed, only one of them even approximates to what the term is understood to imply.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.