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Caption: Mathematical Models by Arnold Emch - Series 4 (1928)
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IV Series %? * formabie hollow thin brass-shell shows h o w these suxfaces are m u t u al b oVvelopable fht >urtao- heSongs n* iho ^ l^s- ot determinant surfaces, this j T e being the ja«r«»L»ian of ^hc u *3r ?|ino!filc «i ,v? 4 3;- -f- o — < \ h,41 v"J ne x) - o - ':" dnd 5(yL I .; ~ > < - h< vv • on the six points - 2" — 2%% = 0, _4i(0 0 (I), ,|,ii1, i 0,t .4.(11. 0. 1;. .1410, 1, 0), 45(1,1, 1), f and A?\\ i, 2 '3, - 1 io Geometrically ir i-> the locos of vertices of q u a ^ n e cones through ohe six points.
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