DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.57409#0449
FILIPPO BRUNELLESCHI.
433
covered with tin, and over these stones shall be cramping-
irons, by which the vaults shall be bound to the buttresses.
The masonry must be solid, and must leave no vacant space
up to the height of five braccia and a quarter : the buttresses
being then continued, the arches will be separated. The first
and second courses from the base must be strengthened every-
where by long plates of macigno laid crosswise, in such sort that
both vaults of the Cupola shall rest on these stones. Through-
out the whole height, at every ninth braccia there shall be
small arches constructed in the vaults between the buttresses,
with strong cramps of oak, whereby the buttresses by which
the inner vault is supported will be bound and strengthened;
these fastenings of oak shall then be covered with plates of
iron, on account of the staircases. The buttresses are all to
be built of macigno, or other hard stone, and the walls of the
Cupola are, in like manner, to be all of solid stone bound to
the buttresses to the height of twenty-four braccia, and
thence upwards they shall be constructed of bricks, or of
spongite fspugne), as shall be determined on by the masters
who build it, they using that which they consider lightest.
On the outside a passage or gallery shall be made above the
windows, which below shall form a terrace, with an open
parapet or balustrade two braccia high, after the manner of
those of the lower tribunes, and forming two galleries, one
over the other, placed on a richly-decorated cornice, the
upper gallery being covered. The rain-water shall be car-
ried off the cupola by means of a marble channel, one-third
of an ell broad, the water being discharged at an outlet
to be constructed of a hard stone, (pietra forte), beneath
the channel. Eight ribs of marble shall be formed on the
angles of the external surface of the Cupola, of such thickness
as may be requisite ; these shall rise to the height of one
braccia above the Cupola, with cornices projecting in the
manner of a roof, two braccia broad, that the summit may
be complete and sufficiently furnished with eaves and chan-
nels on every side ; and these must have the form of the
pyramid, from their base, or point of junction, to their ex-
tremity. Thus the Cupola shall be constructed after the
method described above, and without framework, to the
height of thirty braccia, and from that height upwards it
may be continued after such manner as shall be determined
F F
433
covered with tin, and over these stones shall be cramping-
irons, by which the vaults shall be bound to the buttresses.
The masonry must be solid, and must leave no vacant space
up to the height of five braccia and a quarter : the buttresses
being then continued, the arches will be separated. The first
and second courses from the base must be strengthened every-
where by long plates of macigno laid crosswise, in such sort that
both vaults of the Cupola shall rest on these stones. Through-
out the whole height, at every ninth braccia there shall be
small arches constructed in the vaults between the buttresses,
with strong cramps of oak, whereby the buttresses by which
the inner vault is supported will be bound and strengthened;
these fastenings of oak shall then be covered with plates of
iron, on account of the staircases. The buttresses are all to
be built of macigno, or other hard stone, and the walls of the
Cupola are, in like manner, to be all of solid stone bound to
the buttresses to the height of twenty-four braccia, and
thence upwards they shall be constructed of bricks, or of
spongite fspugne), as shall be determined on by the masters
who build it, they using that which they consider lightest.
On the outside a passage or gallery shall be made above the
windows, which below shall form a terrace, with an open
parapet or balustrade two braccia high, after the manner of
those of the lower tribunes, and forming two galleries, one
over the other, placed on a richly-decorated cornice, the
upper gallery being covered. The rain-water shall be car-
ried off the cupola by means of a marble channel, one-third
of an ell broad, the water being discharged at an outlet
to be constructed of a hard stone, (pietra forte), beneath
the channel. Eight ribs of marble shall be formed on the
angles of the external surface of the Cupola, of such thickness
as may be requisite ; these shall rise to the height of one
braccia above the Cupola, with cornices projecting in the
manner of a roof, two braccia broad, that the summit may
be complete and sufficiently furnished with eaves and chan-
nels on every side ; and these must have the form of the
pyramid, from their base, or point of junction, to their ex-
tremity. Thus the Cupola shall be constructed after the
method described above, and without framework, to the
height of thirty braccia, and from that height upwards it
may be continued after such manner as shall be determined
F F