"--_Horological Review_, New York.
"Of all the simple treatises on the properties of lenses that we have
seen, this is incomparably the best.... The teacher of the average
medical student will hail this little work as a great boon."--_Archives
of Ophthalmology, edited by H. Knapp, M.D._
DIOPTRIC FORMULAE FOR COMBINED CYLINDRICAL LENSES.
"This little brochure solves the problem of combined cylinders in all
its aspects, and in a manner simple enough for the comprehension of the
average student of ophthalmology. The author is to be congratulated upon
the success that has crowned his labors, for nowhere is there to be
found so simple and yet so complete an explanation as is contained in
these pages."--_Archives of Ophthalmology, edited by H. Knapp, M.D._
"This exhaustive work of Mr. Prentice is a solution of one of the most
difficult problems in ophthalmological optics. Thanks are due to Mr.
Prentice for the excellent manner in which he has elucidated a subject
which has not hitherto been satisfactorily explained.
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