=THE ADON.=--An excellent little Telephoto lens for Nests, etc., in inaccessible places. =RAPID TELEPHOTO= Lenses for moving objects. =THE STIGMATIC LENSES= for all-round work. =PATENT GROUP LENSES=, Series D. These are invaluable for very rapid exposures of distant animals or birds. They work at F/6, and on small plates give crisper images than any anastigmats. _CATALOGUES AND ADVICE FREE._ =J. H. DALLMEYER, Ltd.,= Show Rooms: 25, NEWMAN STREET, LONDON, W. Offices and Works: DENZIL ROAD, NEASDEN, N.W. Transcriber’s Note: This book was written in a period when many words had not become standardized in their spelling. Words may have multiple spelling variations or inconsistent hyphenation in the text. These were left unchanged. Words and phrases in italics are surrounded by underscores, _like this_. Words and phrases in bold are surrounded by equal signs, =like this.= One footnote was moved to the end of the chapter. Final stops missing at the end of sentences and abbreviations were added. Captions to illustrations are in upper case letters. Descriptions in lower case were added to illustrations without captions. Illustrated drop cap is indicated thus: [Illustration: T]he ...