General and practical optics / by Lionel Laurance.

  • Laurance, Lionel.
Date:
1914
Catalogue details

Licence: In copyright

Credit: General and practical optics / by Lionel Laurance. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

    9/390 page 7
    PREFACE No one recognises more fully than I the errors of omission and commission to be found in the first edition of Greneral and Practical Optics. It has, however, apparently served the j^^-i^'pose for which it was designed, and I trust that some, at least, of its faults will be found remedied in this second edition, in which the subject-matter has been entirely rewritten, there being but few paragraphs of the original left untouched. In addition, the arrange- ment has been materially changed, some seemingly unnecessary matter having been omitted, while a large amount of new matter has been intro- duced, and most of the diagrams are new. Although primarily intended as a textbook for candidates for the examination of the Worshipful Company of Spectacle Makers, it is written also for other students of optics as a reference book for those engaged in spectacle work, and as an introduction to the study of more pretentious volumes and those dealing with special branches of optical science. In the preface to the first edition I acknowledged my indebtedness to Dr. George Lindsay Johnson. In this I have to acknowledge the valuable aid, in writing, compiling, revising, and correcting the work, of Mr. H. Oscar Wood, who has also made all the new diagrams. As I have said in the preface to Visual Optics and Sight-Testing, I have endeavoured to cover in the two works all that is essential for the sight-testing optician. LIONEL LAUBANCE.
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