DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.7595#0090
78
ESSAY ON
chap. in. from, and connecting each pair of opposite angles, a e,
hf, eg, and dh, thus crossing each other in a point i,
immediately over the centre, a e, hf, c g, being the
spans of the arches which thus lie in the entire surface
of a hemisphere of which they are great circles.*
Between each pair of neighbouring groins, an inter-
mediate one i, k, &c. has been placed, extending along
the hemisphere to k or /, from the centre i, half-way
to the outside. Here a horizontal rib k m n, or /p q,
strikes outwards, and meets three arches, asjfh,f m,
piatexuu.fn, from each of the imposts bf, &c. In Plate XLIIL,
this construction is shewn in wicker-work, as now
standing in my garden.
Roof of Ely The roof of Ely Minster, where the nave and tran-
cept meet, is formed upon a similar general plan, but
piateXLiv. is rather more complicated, as shewn in Plate XLIV.
and ground plan, Plate XL. Fig. 3. A set of imposts,
a, b, c, d, e,y, placed, as in the two last cases, in the
angles of an octagon, support the whole structure.
Over the centre is placed an octagoual frame of oak,
supporting a lantern, the size of which is about one
third of the lower octagon, the upper one having its
* In the last case they were likewise in a hemisphere, but of which they were small
circles, the diameter of that sphere being a, e, Fig. 1.
ESSAY ON
chap. in. from, and connecting each pair of opposite angles, a e,
hf, eg, and dh, thus crossing each other in a point i,
immediately over the centre, a e, hf, c g, being the
spans of the arches which thus lie in the entire surface
of a hemisphere of which they are great circles.*
Between each pair of neighbouring groins, an inter-
mediate one i, k, &c. has been placed, extending along
the hemisphere to k or /, from the centre i, half-way
to the outside. Here a horizontal rib k m n, or /p q,
strikes outwards, and meets three arches, asjfh,f m,
piatexuu.fn, from each of the imposts bf, &c. In Plate XLIIL,
this construction is shewn in wicker-work, as now
standing in my garden.
Roof of Ely The roof of Ely Minster, where the nave and tran-
cept meet, is formed upon a similar general plan, but
piateXLiv. is rather more complicated, as shewn in Plate XLIV.
and ground plan, Plate XL. Fig. 3. A set of imposts,
a, b, c, d, e,y, placed, as in the two last cases, in the
angles of an octagon, support the whole structure.
Over the centre is placed an octagoual frame of oak,
supporting a lantern, the size of which is about one
third of the lower octagon, the upper one having its
* In the last case they were likewise in a hemisphere, but of which they were small
circles, the diameter of that sphere being a, e, Fig. 1.