On Abbe's apochromatic micro-objectives and compensating eye-pieces, made of the new optical glasses in the works of Dr. Carl Zeiss in Jena, with some general remarks on object glasses / by Adolf Schulze.

Schulze, Adolf.

Date:: [1886?]

Credit: On Abbe's apochromatic micro-objectives and compensating eye-pieces, made of the new optical glasses in the works of Dr. Carl Zeiss in Jena, with some general remarks on object glasses / by Adolf Schulze. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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$On Abbe's Apochromatic Micro-Objectives and Compensating Eye- pieces, made of the new Optical Glasses in the Works of Dr. Carl Zeiss in Jena, ivith some general remarks on Object Glasses. By Adolf Schulze. [Read before the Society, 17th November, 1886.] It is at the request of Dr. M'Kendrick that I come here this evening in order to call your attention to an important advance which has quite recently been made in the construction of micro- scopical objectives, an advance which is a matter of the greatest possible interest and gratification, not only to the microscopist, but to many others besides; because the means by which this improvement has been attained are equally applicable to the con- struction of telescopes, photographic lenses, spectroscopes, and, in fact, to the construction of nearly all optical instruments. I refer to the invention of new kinds of optical glasses, which permit, firstly, of the almost complete correction of the spherical aberra- tion of lenses, as far as their curvatures will permit; and, secondly, of the correction of the chromatic aberration by the elimination of the so-called secondary spectrum. Those of you who have followed the improvements in the con- struction of the microscope during the last ten years will be aware that they are nearly all due to the genius of Dr. Ernest Abbe, Professor in the University of Jena, now the first living authority on microscopical optics, and who, in the execution of his inventions, is most ably seconded by the eminent optician, Dr. Carl Zeiss. It was Professor Abbe who gave us a few years ago his now famous theory of the formation of the microscopical image by diffraction spectra, a theory which is easily proved by a series of experiments which are among the most interesting and fascinating in the domain of experimental optics ; and it was Abbe who introduced lucid mathematical expressions of the relations of aperture, resolv- ing power, and penetration; in fact, it was he who brought light where formerly there had been nothing but confusion and dark- ness. It was Abbe also who, about seven years ago, invented the objectives for homogeneous immersion; and now we have to thank$