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An instrument for telegraphically transmitting a picture and reproducing its image as a positive or negative. The transmitter includes a camera obscura and a row of minute selenium cells. The receiver includes an oscillograph, ralay, equilibrator, and an induction coil the sparks from which perforate a paper with tiny…

Any apparatus for making distant objects visible by the aid of electric transmission.

An instrument of such focal length that it may be used as an observing telescope for objects close at hand or as a long-focused microscope.

A polariscope arranged to be attached to a telescope. Lockyer.

To slide or pass one within another, after the manner of the sections of a small telescope or spyglass; to come into collision, as railway cars, in such a manner that one runs into another. [Recent]

An adjustable traveling bag consisting of two cases, the larger slipping over the other.

A spectroscope arranged to be attached to a telescope for observation of distant objects, as the sun or stars. Lockyer.

A stereoscope adapted to view distant natural objects or landscapes; a telescopic stereoscope.

An instrument for indicating changes of temperature without indicating the degree of heat by which it is affected; especially, an instrument contrived by Count Rumford which, as modified by Professor Leslie, was afterward called the differential thermometer.

An apparatus for the detection of trichinæ in the flesh of animals, as of swine.

An instrument for viewing the interior of the urethra.

An instrument resembling the phenakistoscope.

A form of machine for exhibiting animated pictures.

An instrument consisting essentially of a glass tube provided with a graduated scale, for exhibiting to the eye the changes of volume of a gas or gaseous mixture resulting from chemical action, and the like.

A telescope devised for looking into a body of water.

An instrument similar to, or the same as, the, the phenakistoscope, by means of which pictures projected upon a screen are made to exhibit the natural movements of animals, and the like.

from the compound lens undecomposed. -- Achromatic prism. See Prism. -- Achromatic telescope, or microscope, one in which the chromatic aberration is corrected, usually by means of a compound or achromatic object glass, and which gives images free from extraneous color.

lative position, as the parts of an instrument; to regulate for use; as, to adjust a telescope or microscope.

The operation of bringing all the parts of an instrument, as a microscope or telescope, into their proper relative position for use; the condition of being thus adjusted; as, to get a good adjustment; to be in or out of adjustment.

to acts; as, an adroit mechanic, an adroit reply. "Adroit in the application of the telescope and quadrant." Horsley. "He was adroit in intrigue." Macaulay.