Largest Dimensions Diameter Equiv. Price. No. of Plate. of Lenses. Focus. --- -------------------- ---------- ------ -------- 1 6-1/2 by 4-3/4 in. 1·3 in. 9 in. £4 10 0 2 8-1/2 " 6-1/2 " 1·6 " 12 " 5 15 0 3 10 " 8 " 2·125 " 15 " 7 10 0 4 12 " 10 " 2·6 " 18 " 9 10 0 5 15 " 12 " 3 " 22 " 11 10 0 6 18 " 16 " 3·5 " 25 " 14 0 0 7 22 " 20 " 4·25 " 30 " 17 10 0 _DALLMEYER "On the Choice and Use of Photographic Lenses."_ Eighth Thousand (Greatly Enlarged), 1s. Descriptive Catalogue on application. 25, NEWMAN STREET, OXFORD STREET, LONDON, W. * * * * * Transcriber's note: Obvious typographical errors were corrected. The spelling of French words has been made consistent. Also made consistent were those words which appear as hyphenated, joined or as two individual words (for example, first class to first-class and some one to someone). Other corrections were made where inconsistent or incorrect spellings were used in the publication. Where the inconsistencies occur in publication titles or quoted text passages, they were left as published. All "oe" ligatures in the printed text were converted to the letters "oe". Some of the entries in the INDEX appear to be missorted alphabetically. They were left as printed. On page 114, one line ends with "modifica-" and it is assumed "tion" was left off the next line. Typographical Corrections Page Correction ==== ======================= 114 modifica- => modification 131 Willat's => Willats's 134 intotroduced => introduced 163 Frith => Firth 177 Coxackie => Coxsackie 186 Pearce => Pierce 248 Nicolas Maas => Nicolaes Maes