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From Bidston Observatory
Jump to navigationJump to search- 08:58, 17 April 2022 diff hist +526 File:Chronometer Room.png current
- 08:54, 17 April 2022 diff hist +581 N File:Bidston's Clock Bond regulator.png Bond regulator photographed in its display case at the Time Gallery, World Museum in Liverpool, ref. 1962.264.5. It is reported that the function of the clock at Bidston performed a service similar to that at Cambridge Observatory, ie. it was kept to accurate Greenwich time for the purpose of time distribution. It was placed into a room adjacent to the observing rooms and at some stage was fitted with electrical contacts for the same purpose. Reference: http://www.inbeat.org/wp-content/uploa... current
- 08:09, 17 April 2022 diff hist +2 File:Bidston Observatory Hotbox.png current
- 08:07, 17 April 2022 diff hist +54 File:Bidston Observatory Hotbox.png
- 08:05, 17 April 2022 diff hist +883 N File:Bidston Observatory Hotbox.png The Bidston Observatory had a fine chronometer room thirty-six feet by twenty-one feet in which the two large hot boxes previously used at Waterloo Dock from 1861/2 were heated by gas from the cellar below. Each could hold one hundred chronometers which would be observed at temperatures between 50º to 85ºF throughout the year. The glazed lids of the boxes allowed observations to be made without requiring their removal. Temperatures would be changed weekly on a Saturday by 10º or 15ºF to show...
- 07:56, 17 April 2022 diff hist +483 N File:Diary of Nautical Almanac.png Diary of Nautical Almanac work Begun on 23rd November 1791, this diary is the main record of the efforts of Nevil Maskelyne, Astronomer Royal, to co-ordinate the production and publication of the Nautical Almanac. It reveals how he organised the work of the 'computers' and 'comparers', people recruited from across the country to conduct and check astronomical calculations on behalf of the Board of Longitude. Category:Instruments Category:Grey Literature current
- 07:45, 17 April 2022 diff hist +36 File:Table of Geography and Hydrography, Cyclopaedia.jpeg current
- 07:44, 17 April 2022 diff hist +115 N File:Table of Geography and Hydrography, Cyclopaedia.jpeg Table of Geography and Hydrography Cyclopaedia Category:Instruments Category:Grey Literature
- 07:42, 17 April 2022 diff hist +52 N File:Stone Time Markings.jpeg Multiple Time Markings on Bidston Hill current
- 07:37, 17 April 2022 diff hist +55 File:Computed Table of moon position.png current
- 07:36, 17 April 2022 diff hist +539 N File:Computed Table of moon position.png Table of moon’s position at midnight showing which stars to use for lunar distance predictions. Sent by Malachy Hitchins to Joshua Moore for midnight December 1798. (Courtesy of Library of Congress.) Government approved nautical almanac with tables of computed lunar distances. Early use of computational static tables for assigning a latitude and longitude to a world in process. Used with a sextant (from 19thC rated at Bidston), quadrant and navigational tables. Often used together with Chron...
- 07:17, 17 April 2022 diff hist +199 File:NauticalAlmanac18thC.jpeg current
- 07:15, 17 April 2022 diff hist +194 N File:NauticalAlmanac18thC.jpeg Government approved nautical almanac with tables of computed lunar distances. Early use of computational static tables for assigning a latitude and longitude to a world in process.
- 06:59, 17 April 2022 diff hist -1 Category:Grey Literature
- 06:58, 17 April 2022 diff hist +22 N Category:Grey Literature Created page with "Category: Archives"
- 06:58, 17 April 2022 diff hist +12 File:Calibration Certificate Sextant.jpeg current
- 06:57, 17 April 2022 diff hist +17 File:Calibration Certificate Sextant.jpeg
- 06:54, 17 April 2022 diff hist +82 N We are here Created page with "File:Properties of n+m-dimensional spacetimes.png Category: Contributions" current
- 06:53, 17 April 2022 diff hist -54 Diamond Liberation Front
- 06:52, 17 April 2022 diff hist +55 Diamond Liberation Front
- 06:50, 17 April 2022 diff hist +93 N File:Properties of n+m-dimensional spacetimes.png We are here: Properties of n+m-dimensional spacetimes Category:Instruments current
- 06:28, 17 April 2022 diff hist +39 N File:Latitude and longitude graticule on a sphere.svg .png CritterCompiler moved page File:Latitude and longitude graticule on a sphere.svg .png to File:Transparentearth.png current Tags: Rollback Undo New redirect Blanking
- 06:28, 17 April 2022 diff hist 0 m File:Transparentearth.png CritterCompiler moved page File:Latitude and longitude graticule on a sphere.svg .png to File:Transparentearth.png current
- 04:58, 17 April 2022 diff hist +25 File:Quandrant.jpeg current
- 04:57, 17 April 2022 diff hist +186 N File:Quandrant.jpeg The quadrant was a simple antecedent to the sextant. The quarter-circle scale allowed direct readings of the altitude of stars above the horizon to help determine latitude.
- 04:54, 17 April 2022 diff hist +93 N File:Harrison-h4-diagram.jpeg Diagram of a Harrison H4 Chronometer rated at Bidston Category:Instruments current
- 04:51, 17 April 2022 diff hist +638 N File:Sextant Tested Bidston.jpeg According to the label on the inner cover of the fitted felt lined wooden box, "This sextant No. 5976 of 6-1/2” radius, divided on Silver and reading to 10” was examined by the Liverpool Observatory, Bidston, Birkenhead on March 2, 1917 and found that the telescopes, shades, mirrors and arc are found “very good” and the instrument is approved for determination of Lunar distances, latitudes etc. with no appreciable error." Enclosed within the box with the sextant is a scope and two eyepieces.... current
- 04:49, 17 April 2022 diff hist +621 N File:Chronometers Hotbox.png This photo from the World Museum in Liverpool’s records shows the small hot box with its lid open. The grid at the base allowed heat to circulate. The chronometers appear to have been arranged for the photograph, but an impression of the accommodation available is evident. The thermometer shown is by Liverpool optician and instrument maker Richard Adie; it was probably not used in this box as it had a vertical stand making it too tall and difficult to view when the box lid was closed - "AHS"... current
- 04:46, 17 April 2022 diff hist +101 N File:Chronometer Room.png Map Plan of the Chornometer Rating Room (from 1965 sketches) Category:Instruments
- 04:44, 17 April 2022 diff hist +186 N File:Chronometer Caveat.png Note with the occupations of stars observed at Liverpool Observatory, Bidston, Birkenhead, during the total Eclipse of the Moon, 1888, January 28 Category:Instruments current
- 04:31, 17 April 2022 diff hist +138 N File:Amillary Sphere.png Amillary Sphere used with sextant and quadrant for celestial longitude (also see transparent earth Category:Instruments
- 04:18, 17 April 2022 diff hist +26 File:Transparentearth.png
- 04:16, 17 April 2022 diff hist +47 N File:Transparentearth.png transparent earth of 18th century
- 04:03, 17 April 2022 diff hist +26 File:Calibration Certificate Sextant.jpeg
- 04:02, 17 April 2022 diff hist -6 File:Harrisson H4 Diamond Pallets.jpeg current
- 03:57, 17 April 2022 diff hist +161 File:Harrisson H4 Diamond Pallets.jpeg
- 03:54, 17 April 2022 diff hist +210 File:Harrisson H4 Diamond Pallets.jpeg
- 03:42, 17 April 2022 diff hist +114 N File:Harrisson H4 Diamond Pallets.jpeg Diamond endstones were said to give the chronometers the precision and longevity needed to keep time
- 02:24, 17 April 2022 diff hist +126 N File:Calibration Certificate Sextant.jpeg Calibration certificate for a sextant, an instrument for measuring longitude via lunar distance and lunar theory
