Table of log10 sec2 [theta] for determining photographic densities by means of nicol prisms
Subtitle: computed by Paul S. Helmick
Series: University of Iowa monographs. 1st ser -- no. 6. May, 1917; University of Iowa monographs. 1st ser -- no. 6. May, 1917.
Publisher: [The University]
Published: 1917
Place of publication: Iowa City]
Language: eng
Number of pages: 16
Subjects: Astronomical photometry
Notes: At head of title: In the series on aims and progress of research.