Pocket watch: technically highly interesting chronometer, "si… - photo 1
Pocket watch: technically highly interesting chronometer, "si… - photo 2
Pocket watch: technically highly interesting chronometer, "si… - photo 3
Pocket watch: technically highly interesting chronometer, "si… - photo 4
Pocket watch: technically highly interesting chronometer, "si… - photo 5

Pocket watch: technically highly interesting chronometer, "si…

Lot 4151
02.03.2024 16:30UTC +01:00
Classic
Starting price
€ 2 000
AuctioneerKarl-Heinz Cortrie GmbH
Event locationGermany, Hamburg
Buyer Premium23.8%
Archive
The auction is completed. No bids can be placed anymore.
Archive
ID 1163618
Lot 4151 | Pocket watch: technically highly interesting chronometer, "si…
Estimate value
€ 2 000 – 5 000
Pocket watch: technically highly interesting chronometer, "sidereal time" Reid & Sons Newcastle 1864
Ca. Ø52mm, ca. 138g, solid silver case, Hallmarks London 1864, original watchpaper, signed John Reid, extremely rare chronometer movement "sidereal time chronometer No. 500", detent chronometer escapement, chronometer balance with gold screws, helical hairspring, diamond endstone, key winding, signed, No.500, original enamel dial, signed and numbered No.500, blued steel hands, in working order, extremely rare. Only very few pocket chronometers were so-called "sidereal time chronometers". Sidereal time is also a true time, but in contrast to solar time, it depends only on the rotation of the Earth. In every astronomical observatory there is a pendulum clock or sidereal time chronometer regulated to sidereal time, so that sidereal time can always be read there. Regulating pendulum clocks or chronometers in sidereal time is the responsibility of chronometer makers or specialists, as electronic measuring instruments cannot be used for this purpose. A sidereal day is the length of one rotation of the Earth, measured from one culmination of a star to the next. It is essentially the same length on all days of the year; there are only minor influences of nutation and precession, but these are only significant for astronomers. A sidereal day is 23 h 56 min 3.44 s long, so it is 3 min 56.56 s shorter than a mean solar day. The sidereal year has 366.2422 sidereal days, one day more than a solar year. A sidereal day is also divided into 24 h of 60 min of 60 s each, which are all correspondingly shorter than solar hours, minutes and seconds. Source: (https://www.cortrie.de/go/rr9).
Auction house category:Pocket watches
Address of auction Karl-Heinz Cortrie GmbH
Süderstr. 282
20537 Hamburg
Germany
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Phone +49 (0)40 21906520
Fax +49 (0)40-219065229
Email
YP.YGLKLFQ@RGS4@
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