!define Rel_Back(e_to, e_from, e_label, e_techn) Rel_(e_to, e_from, e_label, e_techn, "<--")

!define Rel_Neighbor(e_from,e_to, e_label) Rel_(e_from,e_to, e_label, "->")
!define Rel_Neighbor(e_from,e_to, e_label, e_techn) Rel_(e_from,e_to, e_label, e_techn, "->")

!define Rel_Back_Neighbor(e_to, e_from, e_label) Rel_(e_to, e_from, e_label, "<-")

which and innumerable other intermediate ones lying in a continual Series between the two rectilinear and parallel edges of the Sun's oblong Image PT, that Image is compos'd, as was explained in the fifth Experiment. And let _ag_, _bh_, _ci_, _dk_, _el_, _fm_ be so many less Circles lying in a like continual Series between two parallel right Lines _af_ and _gm_ with the same distances between their Centers, and illuminated by the same sorts of Rays, that is the Circle _ag_ with the same sort by which...

ones lying in a continual Series between the two rectilinear and
parallel edges of the Sun's oblong Image PT, that Image is compos'd, as
was explained in the fifth Experiment. And let _ag_, _bh_, _ci_, _dk_,
_el_, _fm_ be so many less Circles lying in a like continual Series
between two parallel right Lines _af_ and _gm_ with the same distances
between their Centers, and illuminated by the same sorts of Rays, that