A text-book on chemistryFor the use of schools and colleges . resents an increased removal of the same kind; 3, onestill farther advanced. Sometimes it happens that each alternate plane of acrystal grows at the expense of the adjacent one, givingrise to hemihedral) or half-sided crystals, as is shown , which represents the tetrahedron, arising in Fig. /I \ 2//~. this manner from the octahedron by the growth of eachalternate face. 1. The octahedron partially modified ;2. The change farther advanced; 3. The tetrahedroncompleted. The angles of crystals are measured by goniometers,Fi
A text-book on chemistryFor the use of schools and colleges . resents an increased removal of the same kind; 3, onestill farther advanced. Sometimes it happens that each alternate plane of acrystal grows at the expense of the adjacent one, givingrise to hemihedral) or half-sided crystals, as is shown , which represents the tetrahedron, arising in Fig. /I \ 2//~. this manner from the octahedron by the growth of eachalternate face. 1. The octahedron partially modified ;2. The change farther advanced; 3. The tetrahedroncompleted. The angles of crystals are measured by goniometers,Fig. 1T9. of which there are sever- al kinds; as the commongoniometer, and Wollas-tons reflecting goniome-ter. This instrument isrepresented in Fig. crystal to be meas-ured, f, is fixed upon amovable support, c?, whichis in connection with thebutton-headed axis of thegoniometer, o, which pass-es through a larger axisin the upright, b ; a is adivided circle, and e its vernier, which is fixed immova-bly on the upright, 6. The edge of the crystal, which is formed by the two What are hemihedral crystals, and how are they produced ? De-scribe the reflecting goniometer.
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Keywords: ., bookcentury1800, bookde, booksubjectchemistry, booksubjectphysics
