384 
ON DR. WIENER’S MODEL OF A CUBIC SURFACE. 
[521 
Hence the formulæ are 
_ 2bc m [a (m — a) + (a — b) (a — c)] 
aA + 2 m (a — b){a — c)— ^ 
G = be + H, 
A VF 
F {2m (m — a) — A) — — be H \ 2 (m — a) + 
m — a 
A VM 
m — a 
6r 2 mm x t = aH {— 2abe F - 2be G + (be — ab — ac) H), 
which gives t ; and then 
which are also unreduced. 
The numerical values are 
F _ 140 + 62 Vl4 G _ - 10-62 Vl4 H __~ 104 Vl4 
5 — 21 VÏ4’ “ 5 — 21 VÎ4 ’ ~ 5 —21VÏ4 
whence t as in the Table.