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From Bidston Observatory
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| Date | Name | Thumbnail | Size | Description | Versions |
|---|---|---|---|---|---|
| 02:24, 17 April 2022 | Calibration Certificate Sextant.jpeg (file) |  |
480 KB | Calibration certificate for a sextant, an instrument for measuring longitude via lunar distance and lunar theory | 1 |
| 03:42, 17 April 2022 | Harrisson H4 Diamond Pallets.jpeg (file) |  |
163 KB | Diamond endstones were said to give the chronometers the precision and longevity needed to keep time | 1 |
| 04:16, 17 April 2022 | Transparentearth.png (file) |  |
288 KB | transparent earth of 18th century | 1 |
| 04:31, 17 April 2022 | Amillary Sphere.png (file) |  |
663 KB | Amillary Sphere used with sextant and quadrant for celestial longitude (also see transparent earth Category:Instruments | 1 |
| 04:44, 17 April 2022 | Chronometer Caveat.png (file) |  |
25 KB | Note with the occupations of stars observed at Liverpool Observatory, Bidston, Birkenhead, during the total Eclipse of the Moon, 1888, January 28 Category:Instruments | 1 |
| 04:46, 17 April 2022 | Chronometer Room.png (file) |  |
153 KB | Map Plan of the Chornometer Rating Room (from 1965 sketches) Category:Instruments | 1 |
| 04:49, 17 April 2022 | Chronometers Hotbox.png (file) |  |
94 KB | 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"... | 1 |
| 04:51, 17 April 2022 | Sextant Tested Bidston.jpeg (file) |  |
17 KB | 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.... | 1 |
| 04:54, 17 April 2022 | Harrison-h4-diagram.jpeg (file) |  |
234 KB | Diagram of a Harrison H4 Chronometer rated at Bidston Category:Instruments | 1 |
| 04:57, 17 April 2022 | Quandrant.jpeg (file) |  |
35 KB | 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. | 1 |
| 06:50, 17 April 2022 | Properties of n+m-dimensional spacetimes.png (file) |  |
82 KB | We are here: Properties of n+m-dimensional spacetimes Category:Instruments | 1 |
| 07:15, 17 April 2022 | NauticalAlmanac18thC.jpeg (file) |  |
105 KB | 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. | 1 |
| 07:36, 17 April 2022 | Computed Table of moon position.png (file) |  |
236 KB | 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... | 1 |
| 07:42, 17 April 2022 | Stone Time Markings.jpeg (file) |  |
12 KB | Multiple Time Markings on Bidston Hill | 1 |
| 07:44, 17 April 2022 | Table of Geography and Hydrography, Cyclopaedia.jpeg (file) |  |
50 KB | Table of Geography and Hydrography Cyclopaedia Category:Instruments Category:Grey Literature | 1 |
| 07:56, 17 April 2022 | Diary of Nautical Almanac.png (file) |  |
470 KB | 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 | 1 |
| 08:05, 17 April 2022 | Bidston Observatory Hotbox.png (file) |  |
172 KB | 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... | 1 |
| 08:54, 17 April 2022 | Bidston's Clock Bond regulator.png (file) |  |
91 KB | 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... | 1 |
