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