General Information

Serial #

7994

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

BRASS CASING; GLASS COVER; GERMAN SILVER OR WHITE METAL (?) FACE & WOODEN CASE HAS GLASS WINDOW IN LID; BRASS HARDWARE; SYNTHETIC FOAM PACKING. BRASS WINDING KEY. METAL & SYNTHETIC CONNECTORS.

Dimensions

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

Length

22.0 cm

Width

19.0 cm

Height

17.8 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Marine Transportation

Category

Navigation instruments & equipment

Sub-Category

N/A

Manufacturer

AKA

Wempe

Country

Federal Republic of Germany

State/Province

Unknown

City

Hamburg

Context

Country

Canada

State/Province

Unknown

Period

THIS CHRONOMETER PROBABLY USED C.1967-L.1970S, AND POSSIBLY LATER

Canada

USED BY GEODETIC SURVEY OF CANADA, PRESUMABLY ON LAND SURVEYS. RECORDS OF A SIGNAL GIVEN AT PRECISE INTERVALS CAN BE IMPRINTED ON A CHRONOGRAPH (POSSIBLY900279) AND COMPARED WITH CELESTIAL OBSERVATIONS. (REF.1, P.27) TO ESTABLISH POSITION OR CALCULATE DISTANCE.

Function

USED BY MARINERS TO DETERMINE LONGITUDE. USED BY SURVEYORS TO DETERMINE POSITION OR DISTANCE

Technical

EXAMPLE OF GOOD QUALITY CHRONOGRAPH OF MODERN MANUFACTURE. MODIFIED BY ADDITION OF ELECTRICAL HEATING ELEMENT, PRESUMABLY TO REDUCE OR ELIMINATE VARIATIONS IN TEMPERATURE WHICH AFFECT THE MOMENT OF INERTIA OF THE BALANCE-WHEEL & THE STIFFNESS OF THE BALANCE SPRING. AS CHRONOMETERS MEASURE TIME BY COUNTING OSCILLATIONS OF A BALANCE-WHEEL CONTROLLED BY A BALANCE SPRING TEMPERATURE VARIATION IS CRITICAL (REF.2,P.32)

Area Notes

Unknown

Details

Markings

CHRONOMETER FACE DIVIDED 1-24 [OUTSIDE CIRCLE]; 0-56 [INCREMENTS OF 8]; 0-60 [INCREMENTS OF 10]. STAMPED ON FACE IS FOLLOWING: 'CHRONOMETERWERKE/ WEMPE HAMBURG/ 7994 [LOGO]'. DECAL APPLIED TO CASING EXTERIOR READS: 'If found return to:/ GEODETIC SURVEY/ SURVEYS & MAPPING BRANCH/ 615 BOOTH ST./ OTTAWA, ONT.': TEXT ALSO APPEARS IN FRENCH/ PLATE SCREWED TO FRONT OF WOODEN CASE READS: 'CHRONOM[ETER]/ [ILLEGIBLE]/ [LOGO] NO. 7994'

Missing

NONE. CASE HAS BEEN MODIFIED BY ADDITION OF ELECTRICAL HEATING ELEMENT AND FOAM PACKING.

Finish

BRASS CASING HAS MOTTLED FINISH, AND WAS PROBABLY LACQUERED (NOW WORN); WHITE METAL FACE; INDICATOR ARMS HAVE BEEN BLUED.

Decoration

N/A