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1974.0139.002
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- OBJECT TYPE
- N/A
- DATE
- Unknown
- ARTIFACT NUMBER
- 1974.0139.002
- MANUFACTURER
- White, Kelvin & James Ltd.
- MODEL
- Unknown
- LOCATION
- Glasgow, Scotland
More Information
General Information
- Serial #
- N/A
- Part Number
- 2
- Total Parts
- 2
- AKA
- N/A
- Patents
- N/A
- General Description
- Wood, leather, brass.
Dimensions
Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.
- Length
- 24.1 cm
- Width
- 22.7 cm
- Height
- 22.8 cm
- Thickness
- N/A
- Weight
- N/A
- Diameter
- N/A
- Volume
- N/A
Lexicon
- Group
- Exploration and Survey
- Category
- Measurement-direction
- Sub-Category
- N/A
Manufacturer
- AKA
- White
- Country
- Scotland
- State/Province
- Unknown
- City
- Glasgow
Context
- Country
- Unknown
- State/Province
- Unknown
- Period
- Unknown
- Canada
-
Unknown - Function
-
Unknown - Technical
-
Unknown - Area Notes
-
Unknown
Details
- Markings
- Tag attached to wooden box reads: 'Article No 149/ Azimuth Mirror/ Kelvin # 8379/ Hydrographic/ Condition - good' White sticker with red border adhered to box reads: 'AZIMUTH MIRROR H.S.No/ Desc . About 8" Complete/ Maker; Kelvin No.8379/ Condition: Good' Instructions adhered to the inside of the box door reads: 'INSTRUCTIONS FOR THE USE OF LORD KELVIN'S AZIMUTH MIRROR.// BEARINGS can be taken with this instrument in two/ ways: - (1) By looking direct at the object over the/ top of the prism. The degrees of the card reflected/ in the prism are then seen close below the object;/ (2) By looking through the lens at the degree/ divisions of the compass card, and at the image of/ the object in the prism which is seen on the proper/ degree of the card. The first method is applicable to/ objects on the horizon, and is more particularly useful/ for taking bearings of distant landmarks which are/ too indistinct to be seen when reflected in the prism./ The second method may be used either for taking/ bearings of objects on the horizon or for taking bear-/ ings of the sun, moon, or stars// For taking bearings by the first method the prism/ is kept turned (arrow-head down) with its mounting/ stopper against the framework. The observer turns/ the instrument round its vertical axis till the prism and/ lens are fairly opposite to the object, and places his eye/ so as to see the object over the prism and reads the/ bearing of the object from the compass card as seen/ reflected in the prism.// For taking bearings by the second method the/ observer looks through the lens at the degree divisions/ of the compass card, and turns the prism (arrow-head/ up) round its horizontal axis till he brings the image of/ the object to fall on the card. He then reads directly/ on the card the compass bearing of the object.// The pointer is used merely as an aid in directing/ the instrument towards the object, but the bearing is/ read directly from the object as seen on the compass/ card. It is not necessary the pointer should be point-/ ing exactly towards the object unless the altitude be/ very high For objects from horizon up to 38 [symbol for degrees] of/ altitude the error on the bearing would be less than/ half a degree, even if the pointer were pointing 4 [symbol for degrees]/ away from the object// Makers - KELVIN & JAMES WHITE, Ltd., 16 to 20 Cambridge Street, Glasgow.'
- Missing
- N/A
- Finish
- Unknown
- Decoration
- N/A
CITE THIS OBJECT
If you choose to share our information about this collection object, please cite:
White, Kelvin & James Ltd., Box, Unknown Date, Artifact no. 1974.0139, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/item/1974.0139.002/
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