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317,944 · Hyatt · "Illuminating Combination-Tile" · Page 2
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section of Fig. 1 on the line y y. Numbers 1 to 6 on the
perpendicular line x x, Fig. 1, indicate the order of succession in
which dead material and light-holes follow each other crosswise of the
fractional grating, the purpose of the numbers being to facilitate a
comprehension of cross-section, Fig. 3, and numbers 7 to 12 on perpendicular
line y y, Fig. 1, also indicate the order of succession in which dead
material and light-holes follow each other crosswise of the fraction, the
purpose of these numbers being to facilitate comprehension of cross-section,
Fig. 5 is an enlarged cross-section of Fig. 2 on the line x x, and Fig. 6 is an enlarged cross-section of Fig. 2 on the line y y. The light-holes of Figs. 3, 4, 5, 6 are represented as closed by the glasses needed to complete the grating-tile. Numbers 1 to 6 on perpendicular line x x, Fig. 2, indicate with reference to Fig. 5 in like manner as the same numbers in Fig. 1 indicate with respect to Fig. 3, and numbers 7 to 12 on perpendicular line y y, Fig. 2, indicate with reference to Fig. 6 in like manner as the same numbers in Fig. 1 indicate with respect to Fig. 4.
Fig. 7 is an enlarged view of Fig. 1, and Fig. 8 is an enlarged view of Fig. 2.
d d on Figs. 3,4, 5, and 6 indicate perfectly-splayed light-holes, and d' d' on Figs. 3 and 4 indicate imperfectly-splayed light-holes.
The hexagonal shapes shown on Fig. 8 in broken hues are designed to make apparent the honey-comb arrangement of the light-holes in, groups of triangles, and to also indicate that the waved or serpentine form of the joint seams and junction sides of the fractional gratings amounts practically to the same thing as the geometrical lines inherent in the honey-comb arrangement of the light-holes, the removed angles and the softened lines being made for the sake of beauty and to make seams less conspicuous to the eye, and also to secure junction sides better adapted for being cemented together.
In Fig. 3, A indicates top fraction A of Fig. 1, and B, Fig. 3, indicates the bottom fraction B of Fig. 1. Looking at A, Fig. 1, and running the eye down the perpendicular line x x, we have first the dead material number 1, seen correspondingly in Fig. 3, at the left hand, where a like number 1 indicates it. Next, we have light-hole number 2, seen correspondingly in Fig. 3,where a like number indicates it. Then comes number 3, dead material again, correspondingly shown in Fig. 3 by a like number. This brings us to the junction edge a of the fractional grating A, where the joint-seam c is seen as a perpendicular crevice between A and B.
We now come to the border light-hole 4 in fraction B, Fig. 1, situated at the junction edge b of fraction B, shown with great clearness in Fig. 3, where a like number, 4, indicates the same. By comparing light-hole 4, Fig. 3, in fractional grating B with light-hole 2, Fig. 3, in fractional grating A, we perceive
that whereas light-hole, has perfectly-splayed sides, light-hole 4 is
imperfect, the side d' next the joint-seam c being almost
perpendicular, a circumstance entirely due to the straight inflexible line
of the junction-seam c c, as shown in Fig. 1, where light-hole 4 is
almost upon the very edge of the grating, illustrated more clearly in the
enlarged section, Fig. 3, where scarce any dead material is seen to exist
between glass 4 and b, the junction side of the fraction. Clearly
there is no chance for splaying the light-hole here, and what is true of this
one hole 4 is true of every other light-hole along the line from X to B in
fraction B, and from A to X in fraction A, Fig. 1. Light-hole 4 in Fig. 1,
as seen enlarged in cross-section, Fig. 3, illustrates the condition of the
whole line of light-holes from X to B in fractional plate B, Fig. 1, and
light-hole 9 in Fig. 1, as seen enlarged in Fig. 4, illustrates the
condition of the whole line of light-holes from A to X in fractional plate,
Fig. 1, the imperfectly-splayed light-hole 9 in fraction A, Fig. 4,
corresponding on one side of the junction-line in plate A with the
imperfectly-splayed light-hole 4 in fraction B, Fig. 3, on the other side
of the junction-line, the two taken together illustrating the character,
condition, and imperfection of all the border light-holes of fractional
gratings in combination-tiles where the dividing-line between the fractions
is an inflexible straight line, as. represented at c c, Fig. 1, and
in the enlarged view, Fig. 7.|
But when, in place of conforming the junction sides of the fractional gratings to the light-holes as lines or rows of holes, the junction sides are made to conform to the light-holes individually, as herein explained, and as illustrated at c c, Fig. 2, (seen to better advantage in Fig. 8,) we have junction sides no more difficult to cement together than when made perfectly straight, and with the additional advantage of joint seams less apparent to the eye when the work is finished, together with the more important advantage of an equality of dead material around every light-hole of the border rows, precisely the same with every other light-hole of the grating wherever located, and with consequently the same splay on the under side, as clearly illustrated by light-hole 4 in Fig. 5, in comparison with light-hole 2, same figure, and as illustrated by light-hole 9, Fig. 6, in comparison with light-hole 11, same figure, the reason for which becomes apparent when the thickness of dead material shown in Fig. 8, between the waved dotted lines that touch and correspond to the contour of the individual light-holes of the gratings, is compared with the thickness of dead material shown in Fig. 7, between the inflexible straight dotted lines that touch but do not correspond to the contour of the individual light-holes of the gratings. Where the lines are straight, as in Fig. 7, all the advantage for splaying the light-holes offered by the dead material, between the light-holes immediately on the line