BAROGRAPH (MRA 047)

Item Code: MRA 047

Condition (In our opinion):7.5/10

Description

A device which is used to measure the atmospheric or barometric pressure is termed as a barometer. The first successful barometrical recording of barometric pressure can be attributed to Alexander Cumming in late 1700s, using barometric clocks. Since then, a number of different types and forms of barometers were created including water-based barometers, mercury barometers, aneroid barometers, barographs, vacuum pump oil barometers, etc.

It has been determined that determining pressure can help predict changes in weather, as well as, for surface weather analysis which can be utilized to regulate high pressure systems, surface troughs and frontal boundaries.

The barometric pressure can be recorded through barograph. It measures the variation in the air pressure and with the help of a system equipped with mechanical levels and a writing arm, it transfers the data on the recording material which is mounted on a cylindrical drum which rotates slowly. The rotation can be adjusted using clockwork to either one drum rotation per day, week or month. They were traditionally used for meteorological use; but now are being largely replaced by computer based electronic weather measuring instruments. Back in the day, marine barographs were dampened by either oil or supercoiled spring to help prevent unstable reading while sailing. In addition, barographs were also used in aircrafts to record the changes in elevation which vary with altitude.

This particular barograph has a metallic outer casing. The casing is scratched due to wear and tear, with no major dent and the glass, as well as, the mechanicals seem to be intact. Furthermore, the manufacturing company and year could not be determined. Though, there is some incomprehensible inscription in Chinese which must be the manufacturer name and made.

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