General Information

Serial #

T/27665

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

CAST IRON BASE/ METAL COVER WITH ONE END AND FRONT GLAZED/ METAL MECHANISM, PARTS/ LEAD SHEATHED SENSOR TUBES

Dimensions

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

Length

38.2 cm

Width

19.1 cm

Height

25.8 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Meteorology

Category

Atmospheric temperature measurement

Sub-Category

N/A

Manufacturer

AKA

Negretti Zambra

Country

England

State/Province

Unknown

City

London

Context

Country

Canada

State/Province

Unknown

Period

Unknown

Canada

AN ENGLISH MADE RECORDER POSSIBLY USED BY THE CANADIAN METEOROLOGICL SERVICE, BUT NOT AS A STANDARD OBSERVING NETWORK INSTRUMENT. THE MERCURY-IN-STEEL THERMOGRAPH IS ONE OF THE MOST ACCURATE & DURABLE METEOROLOGICAL RECORDING THERMOMETERS BUT DOES NOT FUNCTION ATTEMPERATURES BELOW THE FREEZING POINT OF MERCURY (-38 DEGREES F.).

Function

AN INSTRUMENT USED TO MEASURE TEMPERATURE AT REMOTE LOCATIONS BY MEANS OF ITS EFFECT ON A LIQUID (E.G. MERCURY) FILLED SENSOR BULB & CAPILLARY TUBE, WHICH ARE CONNECTED TO & ACTUATE A BOURDON TUBE, WHICH IN TURN ACTIVATES THE RECORDER'S PEN MECHANISM. THE 2ND SENSOR & PEN ALLOW IT TO ACT AS A RECORDING PSYCHROMETER.

Technical

A LIQUID-IN-METAL RECORDER IN WHICH A SENSING BULB IS CONNECTED TO A BOURDON TUBE BY CAPILLARY TUBING, ALL MADE OF STEEL & MERCURY FILLED; A TEMPERATURE CHANGE AT THE BULB CAUSES A CHANGE IN INTERNAL PRESSURE WHICH AFFECTS THE BOURDON TUBE & THE LATTER ACTUATES THE PEN MECHANISM.

Area Notes

Unknown

Details

Markings

Interior plate reading 'MADE IN ENGLAND/ TEMPERATURE RECORDER/ PATENT NOS. 374,518/ 167,000/ RANGE -40/ +120oF/ NO.T/ 27665'/ plate on front reading 'NEGRETTI & ZAMBRA/TRADEMARK/LONDON' & 'Made for/ Instruments Ltd./ Ottawa & Toronto/British Make'.

Missing

ONE PEN & ARM, TWO INK BOTTLES From CA of 10/29/1993 by Tony Missio: Yes - missing one pen arm

Finish

BLACK PAINTED CASING, MECHANISM, SENSOR TUBES/ METALLIC DRUM, PEN ARM, CABLES/ BRASS COLOURED HANDLE

Decoration

N/A