Volltext Seite (XML)
54 figures of crystals. ‘ W0 f *“' i ° ler,,ect - I* f«»4 in the fol- ae^Stioi of ,h ' 5 ; hree *"'• l < « symbols of any two faces, g parameters, hkl, pep- the u _ hr — y = ip_j ir ^ yf = j l q_ fog' or = £oT = I,ow=i FIG - 73 - 11 Y w ’ Z On, oy, ow being taken to wards x y, z, or in the op- P° e Section, according negiJ;" 8X6 P ° 8itiTO - »ffc e %ut e K' ile ‘°,° tor its edges. Then, the pro to op. tIle CC * gC the two faces meet, will be parallel ar<fprojections upon a S® figUrCS ° f 1 CT y atda of the cubic system lines not perpendicrdnr + i^° th * faCe 010 > b 7 parallel at right angles in o • w ff,' T Z0X ’’ xox ' intersecting In oz, ox take the n ° V° thean S l0 X0Y ' ma y be about 20°. take or equal tof P C ’, A e h ui(b stant from o ; and in oy ot, <* ta jHi „v r rii w , 10 on,! - fourti ' ° f »*•1" °Z or towards x' y' J „ I- 3 “° A ’ T ° B ’ towards x - Y > z Then, the projection offT 38 U ’ W are P os iti VR or negative. Parallel to the line foinin g ° “ th ° faCUS meet > b ° ^^eonheparanehiped uYw. 311 °PP°site angle of the are intersected^ theT/ 116 ST* 8 in which X0X '’ Y0T '> zo?! pairs of distances on , eS ° ai,y slm P !e form > the 1 * - tl« (J If _ A 17 AIZ' /M. A .f _1 _ . 11 1 Y- * pairs of distances on , eS ° ai,y slm P !e form > the proportional to oa m, „ ’ 0K > 0K . ol, ol' should be taken Tb e figures of ^ * ? res P ect iYely. tions upon a m,,*,?" 8 . a a ,. op tbe pyramidal system, >oi, by lin nterscctin hint from i as u, v are positive nr." *’ 1 ° r towards x '> Y '> according ffige in which the faces"!^' t tlw l )ro j ection °f tbe joining ° and the opposite 1 Z' 1 be H™ lld to the line tions upon a plan? ,,. 8 „°! tbe Pyramidal system, are proiee- dicular to that f ace ni ,' e face (m > b y lines perpen- angles in o. I a 0X 'J™ xox > intersecting at right ° V e I ual ^ >, Iob, towards V ! v e<|,, I (li8t,U ! t f 7’ n ‘ °’ and as u, v are positive ’ 0r towards x . aeeorc joining o and the oppoaite *u in be ! ,arallel to the line projections of the greater non i , tho Parallelogram uv. The t 'r °\°* (—a I be figures of crystals of +i ? , vvitb them. of the rhombohedral system, are pro-