Cooke, Josiah Parsons, 1827-1894 · Boston, Little, Brown and Company · leaf 182
a : a:tjo a : oo &,oa a : CO a : m a : b. — J (a ; o :co a: i b),-\- i {a : a :co a : b). + R —iR +2K. Fig. 131. … -f- J (a : o :qo a : 6),-(- j ( oo a : 00 a : oo a ; &). Fig. 128 there are evident- ^e- ^^■ ly the faces of two rhom-bohedrons, the one positiveand the other negative. Ifwe assume that the faces let-tered r are those of the prin-cipal rhombohedron, R, thenit is evident that the faceslettered…
Matter · Heat
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