Lastly comes the central body (4 _e_) of five intersecting
tetrahedra, with a "cigar" at each of their twenty points--of which only
fifteen can be shown in the diagram--and a ring of seven atoms round an
eighth, that forms the minute centre of the whole. Into this elaborate body
one hundred and twenty-eight atoms are built.
TITANIUM: One carbon atom 216
4 _c_ of 88 atoms 352
12 _d_ of 14 " 168
Central globe 128
----
Total 864
----
Atomic weight 47.74
Number weight 864/18 48.00
ZIRCONIUM (Plate XV, 3) has exactly the same outline as titanium, the
carbon atom is similarly distributed, and the central body is identical.
Only in 5 _c_ and _d_ do we find a difference on comparing them with 4 _c_
and d. The _c_ ovoid in zirconium shows no less than fifteen secondary
globes within the five contained in the ovoid, and these, in turn, contain
altogether sixty-nine smaller spheres, with two hundred and twelve atoms
within them, arranged in pairs, triplets, quartets, quintets, a sextet and
septets.
Pages:
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125