General Information

Serial #

381M

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

NON-FERROUS METAL CASING & OUTER TUBE WITH METAL PARTS/ FERROUS METAL BASE/ METAL GIMBAL/ GLASS BAROMETER & THERMOMETER TUBES/ METAL THERMOMETER HOLDER & SCALE/ SYNTHETIC SCALE COVER/ MERCURY IN BAROMETER & THERMOMETER TUBES

Dimensions

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

Length

12.0 cm

Width

8.0 cm

Height

99.0 cm

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

Environment CA

Country

Unknown

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Unknown

Period

1950S+

Canada

SPECIALIZED VERSION OF CANADIAN BAROMETER ORIGINALLY DESIGNED IN 1930'S BY DR. JOHN PATTERSON, DIRECTOR OF MSC 1928-1946, & USED EXTENSIVELY BY MSC UNTIL AT LEAST 1970'S. FROM 1940S PATTERSON BAROMETER WAS STATION BAROMETER AT CANADIAN OBSERVING STATIONS & SEVERAL VERSIONS, INCLUDING MOUNTAIN & MARINE INSTRUMENTS, WERE PRODUCED BY MSC IN SUBSEQUENT YEARS.

Function

INSTRUMENT THAT MEASURES ATMOSPHERIC PRESSURE BY MEANS OF ITS EFFECT ON COLUMN OF MERCURY. THIS TYPE WAS USED ABOARD SHIP.

Technical

MARINE VERSION OF CANADIAN FIXED CISTERN BAROMETER MODIFIED TO BE USABLE ON SHIPS. SECTION OF CAPILLARY TUBING WAS PLACED IN NARROW PORTION OF STANDARD BAROMETER TUBE, FORMING CONSTRICTION WHICH INTRODUCE LAG INTO BAROMETER TO MINIMIZE PROBLEMS CAUSED BY SHIP'S MOTION. MARINE BAROMETER HAD GOLD SCALE & GIMBAL MOUNTING.

Area Notes

Unknown

Details

Markings

INCISED BLACK LETTERING ON SCALE FOR 870 TO 1100 MB, & READING "M.S.C./ TYPE C/ 381/ M"/ THERMOMETER SCALE MARKED FOR 260 TO 320 & +8 TO -7 WITH LETTERING READING "MARK IV", "CORRECTION TO BAROMETER", "HEIGHT ABOVE WATER LINE", "NEGRETTI & ZAMBRA/ LONDON"/ BLACK LETTERING ON THERMOMETER READS "286 MO 1347/HO NPL 40 00 8933" WITH NEGRETTI & ZAMBRA LOGO

Missing

CISTERN ADJUSTMENT SCREW From CA of 04/28/2004 by Sue Warren: No - Complete

Finish

GLOSSY GREEN PAINTED EXTERIOR/ GOLD SCALE/ PLATED BASE & PARTS/ BLACK PAINTED GIMBAL & PARTS/ PLATED PARTS/ METALLIC THERMOMETER SCALE/ WHITE BACKED THERMOMETER/ COLOURLESS TRANSPARENT GLASS & SYNTHETIC

Decoration

N/A