Heliometer observations for determination of stellar parallax made at the Royal Observatory, Cape of Good Hope
A technical report of heliometer measurements of stellar parallax carried out by David Gill at the Royal Observatory, Cape of Good Hope, printed in London by Eyre and Spottiswoode in 1893 for professional astronomers. The one indexed plate is an Astronomical Society of the Pacific bookplate: a circular seal with a winged figure holding a torch astride a crescent moon and stars, set inside a corner border of scrolling Art Nouveau linework with an "Ex Libris" heading.
