General Information

Serial #

16108

Part Number

1

Total Parts

10

AKA

N/A

Patents

N/A

General Description

Metal/ Wood/Synthetic

Dimensions

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

Length

33.6 cm

Width

24.1 cm

Height

12.0 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

Watts

Country

England

State/Province

Unknown

City

London

Context

Country

Unknown

State/Province

Unknown

Period

Unknown

Canada

Used by Canadian surveyor from EMR (now Natural Resources Canada) to make maps of low order precision over large areas - typically 1 km. between points.

Function

Allows the operator to sight a distant object and use the line of sight to either draw a line in the direction of the object or to measure the angle to the object from a specific point of reference. This device is usually used in conjunction with a plane table and is used to plot a point on a map or to create a map.

Technical

Mid 19th century technology based on simple alidades but allowing map making with a plane table over much larger areas with similar accuracy as with simple alidade.

Area Notes

Unknown

Details

Markings

.001 (Alidade) Mfr. Information: 'E.R. WATTS & SON./ LONDON.' ; '[Company logo] ERW&S' ; 'No 16108' ; INSTRUMENTS LTD./ OTTAWA & TORONTO' Bears mark '431'.

Missing

None

Finish

Unknown

Decoration

N/A