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Of or pertaining to actinism; as, actinic rays.

Not transmitting the actinic rays.

Capable of transmitting the chemical or actinic rays of light; as, diactinic media.

An instrument for measuring and recording the variations in the actinic or chemical force of rays of light. Nichol.

The science which treats of rays of light, especially of the actinic or chemical rays.

An instrument for measuring the actinic effect of rays of light.

taining to the measurement of the intensity of the solar rays, either (a) heating, or (b) actinic.

The measurement of the chemical or actinic energy of light. Abney.

An apparatus for the production of sound by the action of the actinic, or ultraviolet, rays.

Pertaining to, or causing the production of, sound by means of the actinic, or ultraviolet, rays; as, actinophonic phenomena.

quantities of radiant heat, especially in different parts of the spectrum; -- called also actinic balance, thermic balance. S. P. Langley.

ng through; also, between, apart, asunder, across. Before a vowel dia- becomes di-; as, diactinic; dielectric, etc.

Highly actinic light, derived from sunlight or from some form of electric lamp, used in the treatment of lupus and other cutaneous affections.

nesium light) which is used in signaling, in pyrotechny, or in photography where a strong actinic illuminant is required. Its compounds occur abundantly, as in dolomite, talc, meerschaum, etc. Symbol Mg. Atomic weight, 24.4. Specific gravity, 1.75. Magnesium sulphate. (Chem.) Same as Epsom salts.

to subject (a plate or film) too long to the actinic action of the light used in producing a picture. -- O`ver*ex*po"sure (#), n.

Of certain achromatic lenses, having the same focus for the actinic and for the brightest of the visual rays.

A method of printing, in which the image is fully brought out by the direct actinic action of light without subsequent development by means of chemicals.

To render sensitive, or susceptible of being easily acted on by the actinic rays of the sun; as, sensitized paper or plate.

Of, pertaining to, or denoting, those rays of light which produce chemical effects; actinic. [R.]