Barometer

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Ingenium, 1987.0578.001
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OBJECT TYPE
MERCURY/SIPHON/U-TUBE/STANDARD
DATE
1959
ARTIFACT NUMBER
1987.0578.001
MANUFACTURER
DOT Meteorological Branch
MODEL
BINDEN-VOCKEROTH U-TUBE BAROMETER
LOCATION
Canada

More Information


General Information

Serial #
N/A
Part Number
1
Total Parts
14
AKA
U-TUBE
Patents
N/A
General Description
STAINLESS STEEL

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length
N/A
Width
N/A
Height
N/A
Thickness
N/A
Weight
N/A
Diameter
N/A
Volume
N/A

Lexicon

Group
Meteorology
Category
Atmospheric pressure measurement
Sub-Category
N/A

Manufacturer

AKA
MSC
Country
Canada
State/Province
Unknown
City
Unknown

Context

Country
Canada
State/Province
Ontario
Period
LATE 1950'S UNTIL AT LEAST C. 1970
Canada
CANADIAN DESIGNED & BUILT STANDARD BAROMETER USED AS CANADIAN PRIMARY STANDARD BAROMETER BY METEOROLOGICAL SERVICE OF CANADA.
Function
A SPECIALLY CONSTRUCTED INSTRUMENT THAT MEASURED ATMOSPHERIC PRESSURE & WAS USED AS CANADA'S PRIMARY BAROMETER, THAT IS, THE BAROMETER BY WHICH OTHERS ARE CALIBRATED (1).
Technical
U-TUBE BAROMETER DESIGNED BY BINDEN & VOCKEROTH AS MSC PRIMARY BAROMETER; IT HAD INVAR PROBES (WITH STEEL POINTS, GRATICULES, & REFECTING PRISMS) PROJECTING INTO TUBES, LIGHTS ON ENDS OF SEPARATE RODS, SCALES OBSERVED BY TELESCOPES, & HAD AN ACCURACY OF 20 MICRONS (REF. 1). THE BAROMETER CONSISTED ESSENTIALLY OF A STAINLESS STEEL U-TUBE OF 3 INCH I.D. THE TOPS OF THE ARMS OF THE U-TUBES WERE CAPPED AND THE HEIGHT DIFFERENCE OF THE FREE MERCURY SURFACES ON THE HIGH VACUUM ARM AND THE TEST PRESSURE ARM ARE WAS MEASURED DIRECTLY BY INVAR PROBES WHICH WERE INTRODUCED VERTICALLY INTO THE ARMS BY O-RING SEALS. PROVISION WAS MADE FOR TO OBSERVE THE COINCIDENCE OF THE MERCURY POINTS ON THE MERCURY SURFACE VISUALLY. THE DECISION ON THE EXACT SETTING OF THE POINTS ON THE SURFACE WAS MADE BY OBSERVING THE DISTORTION OF THE REFLECTION OF A GRID OF STRAIGHT LINES CAUSED BY THE DEFORMATION OF THE MERCURY SURFACE ON THE ENTRY OF THE PROBE POINT. THE PROBE ARMS WERE GRADUATED IN MILLIMETRES & THE HEIGHT DIFFERENCE BETWEEN THE FREE SURFACES OF THE MERCURY WAS MEASURED BY MEANS OF TWO MICROMETER TELESCOPES FIXED ON A STEEL PILLAR. THE ZERO DIFFERENCE BETWEEN THE POINTS WASW ESTABLISHED BY ALLOWING THE TWO FREE MERCURY SURFACES TO FORM A LEVEL SURFACE BY EQUALIZING THE PRESSURE IN BOTH ARMS. THE MEAN TEMPERATURE OF THE MERCURY COLUMN WAS ESTIMATED BY A SERIES OF 10 TEMPERATURE PROBES SPOTTED AT EQUAL INTERVALS THROUGHOUT THE MERCURY COLUMN. IT WAS ESTIMATED THAT THE PRESSURE COULD BE DETERMINED TO AN ACCURACY OF 20 MICRONS IN THE ROUTINE USE OF THIS STANDARD. (REF. 2).
Area Notes
Unknown

Details

Markings
NONE
Missing
LATHE BEDS, OTHER PARTS From CA of 11/03/1993 by Tony Missio: Undetermined According to MSC meteorologist (Oct. 2007), this artifact comprises only a portion of the original barometer and is missing a good part of its ancillary contstruction.
Finish
STAINLESS STEEL
Decoration
N/A

CITE THIS OBJECT

If you choose to share our information about this collection object, please cite:

DOT Meteorological Branch, Barometer, circa 1959, Artifact no. 1987.0578, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/1987.0578.001/

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