1/31/2023, 3:2:34
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Canadian Met. Office Marine Barograph (1 of 6)
Richard Twort
Somerset, UK

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Canadian Met. Office Marine Barograph

REF: LA426002
£675
€768
$834
Certified DealerApproved listing200 sales by dealer
Certified DealerApproved listing200 sales by dealer
Description
This is a large pattern, open scale marine barograph introduced by the Canadian Meteorological Service from 1957. The scale is from 960 to 1040 millibars, ie, 80mbs rather than the usual 100mb range, creating an even more detailed record. The large drum has a revolution of just over 3 days, presumably designed for crossing the Great Lakes and ideal for the crossing the seas around the UK. The movement uses the tried and tested external spring mechanism developed by Richard Freres some 60 years earlier. The spring was incorporated into a totally new design including for marine use by the highly respected W.E. Knowles Middleton and is referenced in his comprehensive volume entitled 'The History of the Barometer' - see extract. He refers to the 'construction affords a convenient zero adjustment and a means of making time marks without touching the pen arm. A slotted link permits transport by air without danger of straining the mechanism'.  The 'piston' damper system on this instrument is the earliest I have seen on a barograph. Apart from marine use the instrument is perfect for the study and recording of minute variations in barometric pressure. The hinged plexiglass lid has a minor chip in one corner and the lid clip mechanism does not function. Comes with approximately 190 correct charts and a fresh bottle of recording ink. 345mm wide x 155mm deep x 245mm high.

measurements

Height:
245 mm
Width:
345 mm
Depth:
155 mm

declaration

Richard Twort has clarified that the Canadian Met. Office Marine Barograph (LA426002) is genuinely of the period declared with the date/period of manufacture being circa 1960

condition

Good condition.

additional info

location

This Canadian Met. Office Marine Barograph is located in United Kingdom

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