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Astrographic Branch papers, 1891 - 1910

Reference Code: GBR/0180/RGO 7/279

Scope and Contents

A volume titled 'Instructions and precedents relating to the Astrographic Branch'. An alphabetical index at the beginning includes the following contents:

Astrographic equatorial, use of (p. 3).

Chemicals for stellar photography: apparatus, etc. (p. 2).

Chart plates (p. 7).

Development of stellar and solar photography (pp. 1 and 11).

Diameters, measurement of (p. 20).

Numbering of photographs (p. 2).

Observing with astrographic equatorial (p. 3).

Superintendance of solar and stellar photography (p. 1).

Stellar plates, ordering of (p. 2).

Varnish. Celluloid of plates (p. 38).

Letters and other papers, many of them also listed in the index, have been bound into the volume, as follows:

Note by Christie regarding the development and examination of catalogue plates, 28 March 1895 (p. 1).

Arrangement of chart and catalogue plates on shelves and in the New Library, 14 July 1893 (p. 5).

Examination of catalogue plates, 20 April 1893 (p. 6).

Note from Christie to Mr Criswick regarding chart plates instruction and the astrographic chart, 10 July 1893 (p. 7).

Note from Christie to Mr Criswick regarding continued instructions on the measurement of the astrographic catalogue plates, 3 January 1895 (p. 8).

Diagram of the arrangement of wires for electric lamp illumination of the astrographic equatorial, 29 April 1891 (p. 9).

Note from Christie to Mr Criswick regarding measures with the astrographic duplex micrometer, 26 February 1895 (p. 10).

Notes on errors in the use of dark slides and discussion of an instruction paper for observers, 20 October and 9 November 1894 (p. 16).

Instructions from Christie to Mr Criswick on using the photographic equatorial, 13 May 1891 (p. 18).

Instructions to Mr Hollis from Christie, 22 January 1897, regarding the Astrographic Catalogue Measurement of Radii of Images (p. 20).

Astronomer Royal's order with regard to measurement of a star's radius, 26 January 1897 (p. 20).

Instructions from Christie regarding the Astrographic Catalogue and measurement of the diameters of star images, January 1897 (p. 20).

Instructions from Christie to Mr Hollis, 15 May 1896, on a proper comparison of chart and catalogue plates, i.e. the Rocket and Mawson plates (p. 22).

Instructions by Christie regarding astrographic measures, 16 September 1899 (p. 36).

Instructions by Christie, 21 May 1908, regarding computing the right ascension and declination of stars from measured co-ordinates (p. 40).

Three points on the Astrographic Catalogue submitted for consideration, 4 December 1908 (p. 42): 1) Shall the stars below the line be taken in the mean in forming the places of stars in R.A. and N.P.D for the catalogue, with an addition giving affirmation; 2) The form of the catalogue; and 3) The publication of the counts of stars.

The volume also contains a number of loose papers, now in an envelope, as follows:

Copy of instructions for the photographic equatorial, copied 19 October 1894.

Detailed explanation of procedures to be followed, signed by Christie, 12 July 1895.

Note from Christie to Mr Hollis, 7 October 1897, requiring that any defective 'Rocket' plates be destroyed and a note made that they were replaced by others free of charge.

Memorandum regarding measures of astrographic plates, 13 November 1897, including the complete list of the plates measured.

Note from F.W. Dyson to Mr Hollis, 31 December 1897, requesting clearance of chart plates for January and February, with financial incentives, the order to apply until 28 February 1898.

Note from F.W. Dyson to Mr Hollis, 31 January 1898, withdrawing the extra payments mentioned in the previous item.

Sheets of figures, with a reference to the daily report dated 25 November 1898 and instructions as to its presentation.

Instructions for a minor renovation of the Astrographic Department dark room on the second floor, 23 October 1903.

Note of 26 November 1903 regarding astrographic plates received from Messrs Elliott, complaining that they are 'very dirty' and requesting information on what to do about them.

Requisition note for two keys and a lock for the door of the developing room on the second floor, 4 May 1904.

'Some remarks on photography made by Sir William Abney at Visitation 1904 June 4.'

Instructions for the order of two new réseaux (one immediately) from Gautier, 27 February 1905.

Note stating that Mr Lyne would like permission to learn the astrographic equatorial, 25 June 1906, with an addition granting the request.

Note from Christie to Mr Hollis stating that four computers will be regularly employed and concerning the finance connected with this, 29 June 1910.

Request for the overhaul of the astrographic duplex micrometer, 17 September 1910, with an addition giving approval.

Examination of astrographic catalogue plates, 'Ilford', 'Mawson' and 'Rocket', 24-30 December 1937 (6 sheets).

Undated request from Mr C. Davidson for the replacement of a broken agate of the astrographic equatorial by steel screws to be made by Mr Niblett.

Undated instructions for the use of the photographic equatorial.

Undated plan of the field of the guiding telescope.


  • Creation: 1891 - 1910


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1 envelope(s) (1 envelope)

1 volume(s) (1 volume)

Language of Materials


Finding aid date

2006-03-30 10:54:07+00:00

Includes index.

Repository Details

Part of the Cambridge University Library Repository

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