SECTION III., 1902 [29] Trans. R. S. C. 
I1.—Correlation of the Curve of the Second Order and the Sheaf of Rays 
of the Second Order in Geometry of Position. 
By Professor ALFRED Baker, M.A., of University of Toronto. 
(Read May 27, 1992.) 
As a convenient notation, C4 is used to denote the projection of C 
from A. 

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To obtain tangents at A and B, A and B are taken as radiant points, 
and A# and BE as base lines, and C is projected on these from A and B, 
giving C4, Cg; also D is projected from A and B, giving D4, Dr. The 
intersection of C4 Cr and D 4 Dz gives F, the intersection of the tangents 
at A and B. 
Again, to find the tangent at Æ, A and Æ are taken as radiant points 
and A B, E B as base lines. The projections of C are C4 and Cg. On 
Cz CA the intersection of the tangents at A and E lies. Hence, finding 
G, the intersection of CzC4 with tangent at A, we have the point 
through which the tangent at Æ passes. 
