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The various designs of mercury barometers and manometers are briefly described, with a more extended discussion of the various design elements which may affect the achievable accuracy.Sources of error in measuring pressures are described in considerable detail, particularly for portable instruments, including sc * ale, temperature, gravity, capillarity, vacuum errors and return gas column.Methods of minimizing those errors and of making the corrections, including extensive tables, are presented.Standard conditions are defined and the pertinent properties of mercury given.The paper contains 65 literature references.(Author).
An alphabetical list of more than 4000 makers and retailers who were active in England, Scotland, Wales and Ireland from the time the barometer was developed for weather forecasting, around 1660, until 1900. Information includes makers working or estimated working dates, the business addresses where known and other items.
Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.
The barometer remains the most important tool for evaluating and predicting the weather. This book explains why knowing accurate values of the atmospheric pressure can improve this process and benefit all applications. Ways to evaluate and calibrate aneroid and electronic barometers using readily available data by Internet or telephone are clearly described. Tactical applications to marine navigation are covered. The book also includes worldwide average monthly pressures and their standard deviations. With the exception of trained meteorological crews, barometers in the past were used at sea primarily to learn if the pressure was going up or down, and whether it was doing this rapidly or slo...