3. An apparatus for telegraphing by means of the sun's rays. See
Heliotrope, 3.
He`li*o*graph"ic (?), a. Of or pertaining to heliography or a
heliograph; made by heliography.
Heliographic chart. See under Chart.
He`li*og"ra*phy (?), n. [Helio- + -graphy.] Photography. R. Hunt.
He`li*o*grav"ure (?), n. [F. hÈliogravure.] The process of photographic
engraving.
He`li*ol"a*ter (?), n. [Helio- + Gr. &?; servant, worshiper.] A
worshiper of the sun.
He`li*ol"a*try (?), n. [Helio- + Gr. &?; service, worship.] Sun
worship. See Sabianism.
He"li*o*lite (?), n. [Helio- + -lite.] (Paleon.) A fossil coral of the
genus Heliolites, having twelve-rayed cells. It is found in the
Silurian rocks.
He`li*om"e*ter (?), n. [Helio- + -meter: cf. F. hÈliomËtre.] (Astron.)
An instrument devised originally for measuring the diameter of the sun;
now employed for delicate measurements of the distance and relative
direction of two stars too far apart to be easily measured in the field
of view of an ordinary telescope.
{ He`li*o*met"ric (?), He`li*o*met"ric*al (?), } a. Of or pertaining to
the heliometer, or to heliometry.
He`li*om"e*try (?), n. The apart or practice of measuring the diameters
of heavenly bodies, their relative distances, etc. See Heliometer.
||He`li*op"o*ra (?), n. [NL., fr. Gr. &?; the sun + &?; a passage,
||pore.] (Zoˆl.) An East Indian stony coral now known to belong to the
||Alcyonaria; -- called also blue coral.
He"li*o*scope (?), n. [Helio- + -scope: cf. F. hÈlioscope.] (Astron.) 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.
He"li*o*stat (?), n. [Helio- + Gr. &?; placed, standing, fr. &?; to
place, stand: cf. F. hÈliostate.] An instrument consisting of a mirror
moved by clockwork, by which a sunbeam is made apparently stationary,
by being steadily directed to one spot during the whole of its diurnal
period; also, a geodetic heliotrope.
He"li*o*trope (?), n. [F. hÈliotrope, L. heliotropium, Gr. &?;; &?; the
sun + &?; to turn, &?; turn. See Heliacal, Trope.] 1. (Anc. Astron.) An
instrument or machine for showing when the sun arrived at the tropics
and equinoctial line.
2. (Bot.) A plant of the genus Heliotropium; -- called also turnsole
and girasole. H. Peruvianum is the commonly cultivated species with
fragrant flowers.
3. (Geodesy & Signal Service) An instrument for making signals to an
observer at a distance, by means of the sun's rays thrown from a
mirror.