Abstract
A NEW form of prismatic binocular, styled the “Service,” has recently been issued by Messrs. J. H. Dallmeyer, and there are many interesting features about it for which special advantages may be claimed. As a rule, binoculars consist of two independent optical trains in separate coverings, either hinged together to allow for the different gauges between the separation of human eyes, or made in different sizes to suit these various distances. In the present form the whole optical arrangement is enclosed in one cover, and in consequence of this, six out of the eight prisms employed and the two objective sliding tubes can all be fixed rigidly to one frame, thus ensuring maintenance of adjustment and strength in adverse circumstances.
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A New Binocular . Nature 67, 473 (1903). https://doi.org/10.1038/067473a0
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DOI: https://doi.org/10.1038/067473a0