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Technical Information

Catalogue No: C1187
Category: General Purpose
Object Type: Test Equipment
Object Name: Manometer
Part No: 6C/865
Serial No: 109/52
Manufacturer: Glass Developments
Division: Unknown
Year of Manufacture: 1952
Dimensions: Width (mm): 310
Height (mm): 1,180
Depth (mm): 270
Weight (g): 11,700
Location: Main Store

Micro Manometer. Null Reading Mk.1.
Ref. No. 6C/865
Serial No. 109/52
Main vernier & pressure scales
graduated at 20° Centigrade.


The Manometer was made by Glass Developments of Brixton Hill. It was found in the Hangers some years ago and acquired by a man who used to make cableforms for Elliott Bros. It resided in his garage until the RAA acquired it.
This is known as a null-reading cistern manometer, equipment and was used for the calibration of pressure-reading instruments.. Much of the existing calibrating gear at present available to Service operational units was insufficiently accurate for the precise calibration of modern aircraft instruments, such as Machmeters, airspeed indicators and altimeters.
The null-reading cistern manometer was developed with the intention of providing a precise means of calibrating pressure measuring instruments over positive or negative pressure ranges up to one atmosphere, and robust enough for unit use, while having accuracy comparable with that of standard equipment hitherto only available at maintenance depots.
Glass Developments last filed accounts in 1990 so have long since gone. Their other claim to fame was making glass buttons.

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