Miscellaneous papers regarding photographic magnitudes in relation to astrographic charts:
Undated file of miscellaneous calculations concerning photographic star maps, including the size of photographic images, the method of measuring the position of images on plates, the refraction in right ascension and north polar distance, chromatic aberration, etc.
Correspondence concerning various aspects of photographic star charts, as follows:
File of memoranda on costs and time estimates, 1888.
Two diagrams of a plate-holder by Christie, 1890.
Correspondence concerning the arrangements of the plates and the selection of centres, 1890.
Correspondence concerning the selection of guiding stars and the distribution of work among participating observatories, 1890.
Papers relating to the distribution of plates .
Papers relating to the investigation of the formula connecting magnitude and diameter, 1903.