The perfected prismometer : its practical advantages, construction, and various applications / by C. F. Prentice.

  • Prentice, Charles F. (Charles Frederick), 1854-
Date:
[1895?]
Catalogue details

Licence: Public Domain Mark

Credit: The perfected prismometer : its practical advantages, construction, and various applications / by C. F. Prentice. Source: Wellcome Collection.

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

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    THE PERFECTED PRISMOMETER: ITS PRACTI- CAL ADVANTAGES, CONSTRUCTION, AND VARIOUS APPLICATIONS. By CHAS. F. PRENTICE, New York. ( With ten woodcuts?) IN the first numbers of these ARCHIVES of the year 1890, I described A Metric System of Numbering and Meas- uring Prisms, which represented the result of a careful and extensive study of the subject, due to the suggestion of Dr. S. M. Burnett, who had entrusted me with the problem of searching for a system which should prove satisfactory to ophthalmologists as well as avoid conflict with the practical methods of manufacturing opticians. At the close of my investigations I felt that this had not only been accom- plished, but that also an instrument in support of that system had been offered as a valuable assistant to opticians. My familiarity with the routine of manufacture would not allow me to lose sight of the practical side, so that this, being a matter of primary importance to opticians, was kept well in view from the outset. In advocating the metric system and the use of the prismometer, I shall therefore here only do so in so far as they relate to the interests of manufacturing and dispensing opticians; the advantages of the system to ophthalmic practice having been previously set forth. My argument in favor of the metric system was and is based upon the unavoidable variability in the angles of our prisms, and which must result from the present process of manufacture. Although this has been indicated in the Reprinted from the Archives of Ophthalmology, Vol. xx., No. i, 1891.