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doc#122 <formul> of <formul>, quantum yields of the order of <formul> have been observed at 85°.
doc#122 liquid carbon tetrachloride at 65° is of the order of magnitude of unity. </p><p> When typical
doc#123 variation of the rate was as much as an order of magnitude. One may conclude that most
doc#123 . These extrapolated fluxes are about an order of magnitude less than the values from
doc#129 <formul>, and let g be a <formul> curve of order k on Q. A general line l meets Q in two
doc#129 singular lines is the <bital>k<eital>th order complex of lines which meet g. </p><p> The
doc#129 Q in two points which are invariant. The order of this congruence is <formul>, since <formul>
doc#129 Since the complex of singular lines is of order k and since there is no complex of invariant
doc#129 follows from the formula <formul> that the order of the involution is <formul>. </p><p> There
doc#129 congruence of its secants is therefore of order <formul> and class <formul>. </p><p> A final
doc#129 of a general plane field of lines, is of order <formul> and class <formul>. Finally, the
doc#129 general bundle of lines is a congruence whose order is the order of the congruence of invariant
doc#129 lines is a congruence whose order is the order of the congruence of invariant lines, namely
doc#129 , namely <formul> and whose class is the order of the image congruence of a general plane
doc#129 image of this pencil is a ruled surface of order <formul> which is met by the plane of the
doc#129 the plane of the pencil in a curve, C, of order <formul>. On C there is a <formul> correspondence
doc#129 composite, with the secant of g and a curve of order <formul> as components. Thus it follows
doc#129 vertex is transformed into a ruled surface of order <formul> having <formul> generators concurrent
doc#129 concurrent at P. Since a ruled surface of order n with n concurrent generators is necessarily
doc#129 involution there is a cone of invariant lines of order <formul>, namely the cone of secants of