Mertz
18 cm (7 inch)
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Index:
Summary;
History;
Current;
Technical;
Source.
In brief
Important Contributions:
Description:
This instrument was sent to the Cape
Observatory
due to the influence of John
Herschel.
In 1838 in a letter to the Admiralty Herschel indicated that he
was anxious that the double stars that he discovered in 1834 –
38 should be re-observed with an instrument of adequate power.
Several attempts were made to find an English instrument of high
quality. Herschel exhaustively tested a Simms 8-inch lens, which
he eventually rejected. He eventually settled on this 7-inch refractor
built by Merz of Munchen. [Warner – Astronomers, p.63.]
Historical Background
Owner:
1849 - present: Cape
Observatory
(now S.A.A.O.)
Where Located:
Cape Observatory. Used as finder scope on the Cox
– Hargreaves
telescope.
Current Information
Present Location:
S.A.A.O. (At headoffice in Cape Town)
Owner:
S.A.A.O.
Status:
Condition:
Technical Details
Type: Reflector / Refractor
Aperture:
Focal Length: 7 inch (17.78 cm)
Mirror / Lens:
Mounting:
Attachments:Browning
Spectroscope
Manufacturer: Merz of Munchen.
Operational History:
Building: In approximately 1849 a new dome was built at the Cape Observatory, 14 ft (4.2 meters) in diameter, in an almost symmetrical setting, 53 yards (48.5 meters) to the north of the East Wing. The framework for the dome was sent out from England, and overlooked when the vessel docked at the Cape. It was found and retrieved from Madras in India seven months later. The dome rotated on six cannon balls. [Warner – Astronomers, p.63.]
Note: Warner stated that the dome rotated on three cannon balls, where in fact it is on six balls.
Note: Koorts refer to this instrument as Mertz, and Warner as Merz.
Sources
Link
to the Main Bibliography
Section
and more information about Sources.
Documentation:
Pictorial Sources:
Bibliography:
- Koorts, W.: The 1882 transit of Venus: The British expeditions to South Africa; MNASSA April 2004, Vol. 63 nos. 3 & 4, pp. 34 - 57.
- Warner, B., Astronomers at the Royal Observatory Cape of Good Hope.
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