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A NEW CORRECTION-SCALE FOR MERCURIAL BAROMETERS

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  • 1 Weather Bureau, Washington, D. C
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Abstract

SYNOPSIS

Corrections, for instrumental errors, the temperature of the mercurial column and for latitude, must be applied before readings of mercurial barometers can be used to represent true atmospheric pressures. Obviously, each operation is a possible source of error, and a direct method of determining correct values is highly desirable.

In 1914, Col. E. Gold, of the British Meteorological Office, suggested a scale to be used with the attached thermometer, by means of which the corrections referred to can be obtained in one reading of the thermometer. This scale, however, can be used for but one pressure; in the present paper the author describes a modified scale from which the same corrections can be obtained for any pressure. The final corrected pressure is obtained in five or less operations instead of six required by other methods, the corrections can he read more accurately, and in addition to the time saved there is a saving of one column of entry in the record-form.

Abstract

SYNOPSIS

Corrections, for instrumental errors, the temperature of the mercurial column and for latitude, must be applied before readings of mercurial barometers can be used to represent true atmospheric pressures. Obviously, each operation is a possible source of error, and a direct method of determining correct values is highly desirable.

In 1914, Col. E. Gold, of the British Meteorological Office, suggested a scale to be used with the attached thermometer, by means of which the corrections referred to can be obtained in one reading of the thermometer. This scale, however, can be used for but one pressure; in the present paper the author describes a modified scale from which the same corrections can be obtained for any pressure. The final corrected pressure is obtained in five or less operations instead of six required by other methods, the corrections can he read more accurately, and in addition to the time saved there is a saving of one column of entry in the record-form.

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