Technical instrument - United Kingdom - 1850-1900 - Grafometer

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Paula Martin-Calero Toro
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Selected by Paula Martin-Calero Toro

Holds a degree in art history; over six years cataloguing and appraising antiques.

Estimate  € 250 - € 300
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Bronze Grafometer dating from 1850–1900, a measuring instrument with 25 cm width, 13 cm height and 13 cm depth, weighing 1.5 kg, made in the United Kingdom, in good used condition with minor signs of aging and spots.

AI-assisted summary

Description from the seller

This is a beautiful copper- or brass measuring instrument known as a graphometer (also called a surveyor's compass).

This instrument was mainly used in the 18th and 19th centuries by surveyors to measure horizontal angles and to map terrain.

How it works
The Compass: In the middle sits a compass that lets the user align the instrument to magnetic north.

The Sights: The four vertical attachments on the sides are the sights. By looking through the slots in these sights, the surveyor could aim precisely at a distant point (such as a stake or beacon).

The Protractor: The semicircular edge is equipped with a scale graduated in degrees. With it one could read the angle between two different points exactly.

This is a beautiful copper- or brass measuring instrument known as a graphometer (also called a surveyor's compass).

This instrument was mainly used in the 18th and 19th centuries by surveyors to measure horizontal angles and to map terrain.

How it works
The Compass: In the middle sits a compass that lets the user align the instrument to magnetic north.

The Sights: The four vertical attachments on the sides are the sights. By looking through the slots in these sights, the surveyor could aim precisely at a distant point (such as a stake or beacon).

The Protractor: The semicircular edge is equipped with a scale graduated in degrees. With it one could read the angle between two different points exactly.

Details

Era
1400-1900
Weight
1.5 kg
Country of Origin
United Kingdom
Material
Bronze
Condition
Good condition - used with small signs of aging & blemishes
Height
13 cm
Width
25 cm
Depth
13 cm
Estimated period
1850-1900
Title additional information
Grafometer
Sold by
The NetherlandsVerified
246
Objects sold
95.45%
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