It is supposed that the latter serves monocular, the other the binocular vision, most birds being able to converge their eyes upon one spot.
Sir Charles Wheatstone discovered its principle and applied it as early as 1838 to the construction of a cumbrous but effective instrument, in which the binocular pictures were made to combine by means of mirrors.
Regnault, a paper on binocular vision.
He succeeded in explaining the colour of thin and of thick plates, and the inflexion of light, and he wrote on double refraction, polarization and binocular vision.
This method, on which he laid great stress, and for the facilitation of which he invented a binocular glass, and devised some skilful mechanical contrivances, was offered by him in 1616 to the Spanish government, and afterwards to that of Tuscany, but in each case unsuccessfully; and the close of his life was occupied with prolonged but fruitless negotiations on the same subject with the states-general of Holland.
The erection of inverted images by prisms, which was applied to the simple telescope by Porro, and to the binocular i (q.v.) by A.
Binocular Instruments The stereoscopic microscope is the most suitable for finding out the space taken up by the separate parts of a preparation.
Binocular microscopes have therefore been constructed on this plan.
- Stephenson'S Binocular Microscope Fig.
59.-Greenough'S Binocular Microscope (Zeiss).
BINOCULAR INSTRUMENT, or briefly Binocular, 4 an apparatus through which objects are viewed with both eyes.
Binocular instruments should aid the natural spatial or stereoscopic vision, or make it possible if the eyes fail.
If the objects be so far The term binocular (from the Lat.
Bini, two at a time, and oculi, eyes) was originally an adjective used to describe things adapted for the simultaneous use of both eyes, as in "binocular vision," "a binocular telescope or microscope"; now "a binocular" is used as a noun, meaning a binocular microscope, a field-glass, &c.
The construction of binocular instruments dates back over several centuries, and has now been brought to great perfection.
The first binocular telescope, consisting of two telescopes placed side by side, was.
The re-invention of the Dutch binocular telescope apparently dates from 1823, and is to be assigned to the Viennese optician, Johann Friedrich Voigtlander (1779-1859); but the credit of having placed these instruments on the market probably belongs to J.
The first binocular microscope was invented by the previously mentioned Father.
The instrument subsequently fell into complete neglect for nearly two centuries, to be revived in 1852 by Charles Wheatstone, who has stated that he had previously studied the problem; the publication of his views in his second great paper "On Binocular Vision," 1 in the Phil.
Riddell (1807-1867) devised his binocular microscope, which contained the essentials of Wheatstone's pseudoscope.
Binocular vision of identical images.
Led to the construction of a non-stereoscopic binocular microscope.
Of Alfred Nachet, who in 1853, and subsequently in 1863, brought forward two forms of binocular microscope.
The earliest stages of the development of the binocular microscope had been always confined to those instruments with one objective, in the immediate neighbourhood of which the systems for dividing the pencil were placed.
The newest form of the binocular microscope is very similar to the oldest form in which two completely separated be made of A.
Binocular Instruments for Range-finding.-For measuring purposes binocular telescopes with parallel axes are the only types employed.