halo scope

[Eng. halo, and Gr. skopeō =to view, to see. J Optics: An instrument invented by M. Bravais for exhibiting the phenomena connected with halos, perihelia, . It comprises prisms and a mirror, which revolve rapidly about an axis, and two plates of gla for intercepting the light. The rotating prisms receive the light from a lamp in a darkened chamber, the refracted rays a uming the form of the perihelion circle. hals (gen it. halos ) =salt, and thrix (gen it. trichos ) hal-ot-rich-ite, hal-ot-rich-ine, s. & 4. [Gr. =hair.] A. As substantive: Mineralogy: 1. Of the form Halo trichite: (1) Halo trichite of Glocker : A yellowish white mineral, with silky fibers and an inky astringent taste. Composition: Sulphuric acid, 35-9; alumina, 11.5; protoxide of iron, 8'1; water, 44.5=100. (2) Halo trichite of Hausmann : The same as Alunogen. 2. Of the form Halo tri chine: A silky ashen mineral from the Solfatara, near Naples. ( Dana .) scribed under A. B. As adj .: Of or belonging to the minerals de including Men do zite, Picker in gite, Apjohnite, BosDana has a Halo trichite group of minerals jemannite, and Halo trichite (q. v.). *hâls, *hâlse, s. [A. S. heals, hæls; Goth., O. Fris., O. S., O. H. Ger., Dan., & Sw. hals; Icel. háls.] 1. Ord. Lang. (of both forms): The neck, the throat. the head of a ship, through which the cable runs; a 2. Naut. (of the form halse ): One of the holes at hawse (q. v.). *hâlse (1), v . t. [Icel. hálsa =to clew up a sail, halvans