Isophotes of comet Arend-Roland were constructed from 20 photographs gained by objective Tessar 1 : 4,5, f = 18 cm. The photographs were exposed in the visible spectral region in integral light, and with orange and blue filters on panchromatic emulsion of Agfa ISS plates (21/10 Din). The plates were measured on recording microdensitometer. The extreme measurable extent of the normal tail was 7° and of the anomal tail 1,5°.
The study of one spectrum of comet Mrkos obtained on 1957 August 23 with an objective prism of dispersion 52 A/mm for λ 4000 A is given in this paper. and Článek doplňuje list se snímky komety (nestránkováno)