Graphometre
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1992.1570.001
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- OBJECT TYPE
- N/A
- DATE
- 1810–1825
- ARTIFACT NUMBER
- 1992.1570.001
- MANUFACTURER
- JECKER
- MODEL
- Unknown
- LOCATION
- Paris, France
More Information
General Information
- Serial #
- N/A
- Part Number
- 1
- Total Parts
- 1
- AKA
- N/A
- Patents
- N/A
- General Description
- BRASS, WITH GLASS FACE & COMPASS CIRCLE DIVIDED ON SILVER. HAIR (?) SIGHTS. WOOD CASE
Dimensions
Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.
- Length
- 34.1 cm
- Width
- 17.5 cm
- Height
- 16.5 cm
- Thickness
- N/A
- Weight
- N/A
- Diameter
- N/A
- Volume
- N/A
Lexicon
- Group
- Exploration and Survey
- Category
- Measurement-angles
- Sub-Category
- N/A
Manufacturer
- AKA
- JECKER
- Country
- France
- State/Province
- Unknown
- City
- Paris
Context
- Country
- France
- State/Province
- Unknown
- Period
- SPECIFIC USE UNKNOWN. THIS TYPE OF INSTRUMENT USED C.17TH C.-EARLY 19TH C.
- Canada
-
TYPICAL OF THE TYPE OF INSTRUMENT USED BY FRENCH SURVEYORS IN ACADIA & QUEBEC IN THE 18TH C. ENGLISH TRAINEDSURVEYORS FAVOURED THE CIRCUMFERENTOR OR THE HOLLAND CIRCLE, DURING THIS SAME PERIOD (REF.1). - Function
-
USED TO MEASURE HORIZONTAL ANGLES, AND LESS COMMONLY, VERTICAL ANGLES - Technical
-
THE GRAPHOMETRE WAS FIRST DESCRIBED BY PHILIPPE DANFRIE IN 1597. IT DERVIED FROM THE ASTROLABE BUT INCORPORATES A SET OF FIXED SIGHTS & A COMPASS. IT WAS THE PRIMARY SURVEYING INSTRUMENT IN FRANCE IN THE 17TH C. & WAS STILL USED INTO THE 19TH C. BY THE MID 19TH C. THE TRANSIT & THEODOLITE LARGELY REPLACED IT IN NORMAL USE. - Area Notes
-
Unknown
Details
- Markings
- 'Jecker A Paris' INCISED IN SCRIPT ON ALIDADE. SEMI-CIRCLE ON LIMB DIVIDED 0-180 AT 10-DEGREE INTERVALS ON LOWER EDGE; DIVIDED 180-0 AT 30-MINUTE INTERVALS ON INSIDE EDGE. VERNIER ON ALIDADE DIVIDED 0-30 AND 30-0 AT 2-MINUTE INTERVALS/ COMPASS FACE HAS QUADRANTS & 1/2-QUADRANTS MARKED; QUARTER QUADRANTS INDICATED. COMPASS CIRCLE DIVIDED 360-0 BY SINGLE DEGREES/ 'W 371' HANDWRITTEN ON TAG & ON TAPE LABEL ON INSTRUMENT/ CASE: 'M. CARRE' STENCILLED IN BLACK ON CASE TOP/ CHRISTIE'S LABEL (?) ON CASE MARKED: '232/ 8 JUN 1992'/ TYPED LABEL INSIDE CASE: 'W 371/ SURVEYORS SEMICIRCLE/ C.1790/ This type of instrument in every size and *
- Missing
- NONE
- Finish
- BRUSHED & LACQUERED BRASS CASING, ALIDADES & SIGHTS, & STAFF MOUNTING. COMPASS CIRCLE HAS BEEN BLUED.
- Decoration
- FLEUR-DE-LIS SYMBOL AT N ON COMPASS FACE
CITE THIS OBJECT
If you choose to share our information about this collection object, please cite:
JECKER, Graphometre, circa 1810–1825, Artifact no. 1992.1570, Ingenium – Canada’s Museums of Science and Innovation, http://collections.ingeniumcanada.org/en/id/1992.1570.001/
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