Scope and Contents Correspondence of G.B. Airy and related papers under the heading 'Cape Observatory and Survey 1849 to 1854. Instruments', divided into thirteen sections:Notes on the barometer used by Henderson.Letters from G.B. Airy to W. Dolland regarding an eyepiece and level for the Cape Transit, 1850-1851.Sir J. Herschel's recommendation for the erection of a transit circle at the Cape, 27 December 1851.Correspondence with the Admiralty regarding the transit circle,...

Scope and Contents Correspondence regarding the loan of equipment to the Royal Observatory, including the following items:Correspondence on the Bendorff Electrometer and Flame Collector.Correspondence on the 45° astrolabe.Correspondence on a coil magnetometer.Correspondence on a 6-inch 45-foot focus lens loaned by J. Worthington of California.Correspondence on the loan of the Cookson Floating Zenith Telescope by the Cambridge Observatory Syndicate,...

Scope and Contents Correspondence relating to mirrors, micrometers and spectrophotometry, including the following material:Correspondence with J. Cooke and Sons on a speculum mirror, 1912.Correspondence with Troughton and Simms on a Duplex micrometer, 1910-1912.Correspondence with the Cambridge Instrument Co. and the National Physical Laboratory on spectrophotometry, 1926-1930.Correspondence concerning a new measuring micrometer for the Cookson Plates and a second micrometer,...

Scope and Contents

Correspondence with the Admiralty, the National Physical Laboratory and various firms, such as Troughton and Simms, regarding the reversible transit circle.

Scope and Contents (1) General correspondence regarding time balls, 1879-1893, including the following material:Correspondence regarding reprints, ordered by G.B. Airy in 1880, of articles from 'Nature', 1876, concerning the distribution of time signals.Correspondence, 1879-1880, regarding the Prussian Government's request for information on colonial time in South Africa, Canada, India, St Helena, Mauritius, Australia, Tasmania and New Zealand, and similar requests from the U.S. Hydrographic...

Scope and Contents

Correspondence, estimates and orders relating to scientific instrument firms, including Negretti and Zambra; Troughton and Simms; Siemens Bros. and Co. Ltd; Adam Hilger Ltd; Phillips; the Cambridge Instrument Co.; C.F. Casella and Co. Ltd; Sir Howard Grubb, Parsons and Co. Ltd; and Vickers.

Scope and Contents Correspondence regarding accounts held with various instrument-makers:Correspondence with Troughton and Simms, 1898-1909, including a summary of the annual cost of cleaning instruments.Correspondence with the Improved Electric Glow Lamp Company concerning the re-silvering and polishing of mirrors, 1899-1900.Correspondence with Victor Kullberg concerning an estimate for the cost of repairs to Osler's anemometer, 1903.Correspondence with Peter Heele,...

Scope and Contents

Correspondence with tradesmen, initials N-W, including letters from booksellers; coal merchants; builders; chandlers; instrument makers (particularly Troughton and Simms); stationers; opticians; parcel carriers; engineers; and carpenters. The letters cover requests; accounts; bills; receipts; tenders; invoices; routine repairs; adjustments; improvements; and shutters for observing domes. There are letters from F. Baily, J. Glaisher and J.H.V. Vian.

Scope and Contents Memoranda concerning miscellaneous astronomical instruments, 1888-1908, including:1. 'Measurements of portable instruments'.2. List of astronomical instruments.3. 'Lubricant for heavy bearings'.4. 'Stauffers Lubricant'.5. 'Observations with small Transit'.6. 'Portable Transits'.7. 'Small Transit Instrument - Paris longitude'.8. 'Mercury basins used with small Transits'.9. 'Transit Pavilion'.10. 'Stellar...

Scope and Contents Correspondence with T. Lewis and E. Dent and Co. concerning repairs to clocks and correspondence with W.H. Shepherd, 1888-1889.Correspondence with Victor Kullberg concerning the tender for the supply of new electric dials and the repair of old ones, 1897-1899.Correspondence with clockmakers, principally V. Kullberg and Dent and Co., concerning repairs to Royal Observatory clocks and chronometers, 1901-1911.Internal memoranda on the subject of clocks, chronographs and...

Scope and Contents 1. SpectroscopesVarious memoranda concerning spectroscopes, 1901-1925.1. 'Spectroscope', 21 September 1901.2. 'Spectroscope', 23 September 1901.3. 'Photographic Spectroscope', January 1900.4. 'Photographic Spectroscope', 14 October 1901.5. 'Christie's direct-vision "half prism" spectroscope'.6. 'Wave lengths of spectrum lines'.7. 'Standard Wavelengths', 1922 (printed).8. 'Report on Pure Carbon Electrodes', 1925.2....

Scope and Contents Papers concerning instruments not held by the Royal Observatory:Extract from 'Engineering', 19 December 1890, concerning the new telescope for Melbourne Observatory.Letter from Bishan-Lal-B-A Sripershad of India regarding the whereabouts of a telescope owned by his father, 1892.Letter from the 'Yorkshire Post' regarding the largest telescope in the world, 1894.Correspondence with Dr Rambaut regarding the new mounting for the 15-inch at the Dunsink Observatory,...

Scope and Contents Correspondence with E. Dent and Co. concerning the replacement of the escape wheel of the magnetic declination time piece, 1891. Correspondence with Troughton and Simms concerning the repair of the declination magnet theodolite, 1892.Correspondence with A. Reuker concerning the design of declination magnets, 1898.Correspondence with the Kew Observatory concerning the supply of a unifilax magnetometer to the Royal Observatory, 1890-1891.Correspondence with...

Scope and Contents Correspondence concerning the proposal to the Board of Visitors for a new universal transit circle, to be called the New Altazimuth Instrument, 1892, includes preliminary correspondence with the Admiralty and the estimated cost of constructing the instrument.Correspondence informing the Admiralty of the resolution of the Board of Visitors in favour of the new instrument and correspondence with the Admiralty asking that they authorise the construction of the instrument, 1892-1893. The...

Scope and Contents Tables showing 'the difference in the values of the runs of the microscope - micrometers as found from observations made during the day and during the night', 1888-1889.Correspondence with Troughton and Simms regarding the supply of an eyepiece and the supply of a long focus lens for the altazimuth instrument, 1889.Correspondence with J.G. Loughborough requesting six 6" cannon balls to raise the Altazimuth Dome 1" higher, 1889. There is also correspondence with the...

Scope and Contents Correspondence with Troughton and Simms concerning the order, construction and testing of the photographic spectroscope, 1895-1901.Miscellaneous correspondence concerning the repair and replacement of spectroscopes, 1885-1895. The correspondents are J. Brashear, J. Browning, Messrs Harvey and Peak, E.W. Maunder and J. Simms.Memoranda concerning spectroscopes, 1886-1896: 1. Oxford Reversion Spectroscope; 2. Half Prism Spectroscope; 3. Suggestions with regard to the...

Scope and Contents Correspondence with the Admiralty concerning the acceptance of Sir H. Thompson's offer of a 26-inch reflecting telescope for £5000, 1894.Correspondence with Sir H. Thompson concerning alterations to the 26-inch reflector and its transfer to the Royal Observatory, 1893-1899.Copies of correspondence between Sir Howard Grubb and A.A. Common concerning alterations and tests relating to the 26-inch reflector, 1895-1899.Correspondence with Troughton and Simms concerning the...

Scope and Contents 'Observations for the determining of the focus of the South East Equatorial for different rays', 1882-1888.Sixteen undated pages of calculations titled 'Correction of chromatic aberration for photographic rays by convex flint lens and concave crown lens placed within principal focus'.Undated sheet of calculations on the separation of the lenses of an object glass.Three undated sheets of calculations on the correction of an object glass for photographic rays by the...

Scope and Contents Correspondence with Sir Howard Grubb concerning the contract for the construction and erection of the Thompson Equatorial Telescope, including:1. Estimate for the cost of the construction of the telescope.2. Copy of the specifications for the telescope.3. Two black and white photographs of the model of the Thompson Equatorial Telescope, sent to the Astronomer Royal by Sir Howard Grubb, 26 March 1894.4. Correspondence concerning alterations to the...

Scope and Contents Report by H.H. Turner on the inclination of the horizontal wire of the transit circle, 24 November 1890.Fifteen tables, one for each year, showing the monthly inclination of the horizontal wire of the transit circle, 1878-1892.Correspondence on the loan of an instrument from the City and Guilds Engineering College to determine the flexure of the transit circle, 1915.Correspondence with Troughton and Simms and with H.H. Turner concerning the difference between...

Scope and Contents Correspondence with Troughton and Simms regarding the polishing of the transit circle object glass and the subsequent overhaul of the instrument, as well as the proposal to fit an aluminium dew cap to the transit circle, 1906.Correspondence with Troughton and Simms on the improved illumination of the transit circle, 1908.Correspondence with Troughton and Simms on the new travelling wire micrometer for the transit circle, including estimates, specifications, and the order and...