Thomas Mercer - Technical instrument - United Kingdom - 1920-1930
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Selected by Dési van Rhee
Over 20 years' experience in antiques with a background in art history.
Estimate € 550 - € 650
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Thomas Mercer chronometer in a wooden case with a 24-hour dial and a 12 cm diameter, dimensions 28 × 21 × 15 cm, origin United Kingdom, in good used condition with small signs of aging and stains, supplied with key and original box.
AI-assisted summary
Description from the seller
Thomas Mercer chronometer, diameter 12 cm: for Surveying and Cartography (Surveying)
This was the most common reason to take a chronometer inland. Just as longitude had to be determined at sea, surveyors in the 19th and early 20th centuries (for example when mapping Africa, India, or the interiors of America) needed to know exactly what time it was at a reference point in order to record their exact position on a map.
2. Astronomical Observations
For astronomers who set up temporary observation posts (for example to observe a solar eclipse or the transit of Venus), a portable, extremely accurate time source was crucial. These instruments were used to log the exact moment of a celestial event.
3. Synchronization of Railways or Telegraphy
Before time was available digitally everywhere, such chronometers were used as a "master clock" to synchronize station clocks along a railway line. The chronometer was carried from station to station to calibrate the local clocks. Thereby the timepiece was equipped with electrical contacts.
Specific details on your photo:
The dial: The 24-hour time scale we see on your photo is typical for scientific use and surveying, because it eliminates calculation errors between day and night.
Keeps good time, wound, with key and original box
Thomas Mercer chronometer, diameter 12 cm: for Surveying and Cartography (Surveying)
This was the most common reason to take a chronometer inland. Just as longitude had to be determined at sea, surveyors in the 19th and early 20th centuries (for example when mapping Africa, India, or the interiors of America) needed to know exactly what time it was at a reference point in order to record their exact position on a map.
2. Astronomical Observations
For astronomers who set up temporary observation posts (for example to observe a solar eclipse or the transit of Venus), a portable, extremely accurate time source was crucial. These instruments were used to log the exact moment of a celestial event.
3. Synchronization of Railways or Telegraphy
Before time was available digitally everywhere, such chronometers were used as a "master clock" to synchronize station clocks along a railway line. The chronometer was carried from station to station to calibrate the local clocks. Thereby the timepiece was equipped with electrical contacts.
Specific details on your photo:
The dial: The 24-hour time scale we see on your photo is typical for scientific use and surveying, because it eliminates calculation errors between day and night.
Keeps good time, wound, with key and original box
Details
Era
1900-2000
Manufacturer/brand
Thomas Mercer
Country of Origin
United Kingdom
Material
Wood
Condition
Good condition - used with small signs of aging & blemishes
Height
15 cm
Width
28 cm
Depth
21 cm
Estimated period
1920-1930
