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A hæmoscope.

An instrument devised by Hermann, for regulating and measuring the thickness of a layer of blood for spectroscopic examination.

An opening made in the interior walls of a cruciform church to afford a view of the altar to those in the transepts; -- called, in architecture, a squint. Hook.

An instrument for exhibition or illustration of the phenomena of halos, parhelia, and the like.

A telescope or instrument for viewing the sun without injury to the eyes, as through colored glasses, or with mirrors which reflect but a small portion of light. -- He`li*o*scop`ic, a.

The representation made of the aspect of the heavens at the moment of a person's birth, by which the astrologer professed to foretell the events of the person's life; especially, the sign of the zodiac rising above the horizon at such a moment.

One versed in horoscopy; an astrologer.

An instrument designed to mark the presence of water, especially in air. Weale.

An instrument which shows whether there is more or less moisture in the atmosphere, without indicating its amount.

An instrument for ascertaining the susceptibility of a person to hypnotic influences.

A kind of ophthalmoscope.

A philosophical toy for exhibiting the prismatic tints by means of thin films.

ch employed in arts of design. Shifting like the fragments of colored glass in the kaleidoscope. G. W. Cable.

A machine, for the production of animated pictures, in which a film carrying successive instantaneous views of a moving scene travels uniformly through the field of a magnifying glass. The observer sees each picture, momentarily, through a slit in a revolving disk, and these glimpses, blended by persistence of vision,…

An instrument for estimating the amount of cream contained in milk by ascertaining its relative opacity.

An instrument, consisting of an arrangement of two mirrors, for reflecting light upon the larynx, and for examining its image.

An instrument, devised by Professor Helmholtz, for testing the color perception of the eye, or for comparing different lights, as to their constituent color or their relative whiteness.

Same as Low side window, under Low, a.

Same as Manometer.

A speculum for examining a natural passage, as the urethra.