The discovery of the plates was first communicated in: MilchoKatjaTsvetkov, “Lohse's historic plate archives”, in Astronomische Nachrichten, cccxx/2 (1999), 63–70.
4.
RenéHudec, “An introduction to the world's largest plate archives”, in la DousConstanzeBräuerHans-Jürgen (eds), Treasure-hunting in astronomical plate archives (Frankfurt a.M., 1999), 28–40.
5.
Lohse's records are currently kept at two different locations: His observation records are now kept with the plates at the Babelsberg Observatory, Germany, and his laboratory records at the Berlin Brandenburg Akademie der Wissenschaften, Berlin.
6.
NicholasJardine, “Sammlung, Wissenschaft, Kulturgeschichte”, in te HeesenAnkeSparyE. C. (eds), Sammeln als Wissen (Wallstein, 2002), 199–220.
7.
PaulKempf, “Nekrolog Oswald Lohse”, in Vierteljahrsschrift der Astronomischen Gesellschaft, 1, 3/4(1915), 160–9.
8.
SebastianDobruskin, “Bestandserhaltung Photographischer Sammlungen”, Museumsmagazin des Museumverbandes Baden-Wuerttemberg, vi (1992), 8–15.
9.
KlausStaubermann, “The trouble with the instrument”, Journal for the history of astronomy, xxxi (2000), 323–38.
10.
Jardine, op. cit. (ref. 6), 219.
11.
von KonkolyNicolaus, Praktische Anleitung zur Himmelsphotographie (Halle, 1887).
12.
To decide on the orientation of the plate, with a brief lick of the tongue the photographer could ‘taste’ which side of the camera was front and which was back.
13.
The recipe for the emulsions is described in the Appendix.
14.
I would like to thank Petra Petrova from the Chemical Institute of Sofia University for valuable help here.
15.
Konkoly, op. cit. (ref. 11).
16.
The recipe for the developer is described in the Appendix.
17.
The fixation of the plates is done with one part (fixation) natron and four parts of water.
18.
JohnHannavy, Victorian photographers at work (Princes Risborough, Bucks, 1997), 117.
