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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.

h 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.

A genus of fungi, remarkable for the great quantity of spores, forming a fine dust, which is thrown out like smoke when the plant is compressed or burst; puffball.

Same as Manometer.

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

ewed through a large lens with stereoptical effects. It is often combined with the stereoscope.

A modification of the magic lantern, used esp. for throwing a magnified image of an opaque object on a screen, solar or artificial light being used.

An instrument containing a combination of colored glasses such that they transmit only red light, so that objects of other colors, as green leaves, appear black when seen through it. It is used for viewing colored flames, to detect the presence of potassium, lithium, etc., by the red light which they emit.…

An astrolabe; a planisphere. [Obs.]

A modification of the stethoscope, for directly auscultating the uterus from the vagina.

rged image of an object which is too minute to be viewed by the naked eye. Compound microscope, an instrument consisting of a combination of lenses such that the image formed by the lens or set of lenses nearest the object (called the objective) is magnified by another lens called the ocular or eyepiece. -- Oxyhydroge…

A spectroscope arranged for attachment to a microscope, for observation of the spectrum of light from minute portions of any substance.