DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.62828#0169
( III )
the dome at the infide, and alfo to combine together the hip
and center ribs.
Proceed next to confider the height of the dome as may be
required. Let 7.6 at No. 1 be the perpendicular height of it,
and let m n be the width of the dome. Then draw a femi-
ellipfis to pafs through the points m 6 n, Divide half of this
femi-ellipfis into as many equal parts as it may be thought
neceffary to have ribs in that fpace, which in this example is
fix. Draw on thefe divifions perpendicular lines, as the figure
fliews, and fubdivide the laft fpace, from which raife a perpen-
dicular as before.
Proceed to No. 2, and divide half the length of the dome,
as f 0, into the fame number of equal parts as half the width
was divided into. From the divifions raife perpendiculars at
pleafure. Take the length of the feveral perpendiculars from
No. 1, and place them on the correfponding perpendiculars at
No. 2, and draw a curve line through each point; then will the
ellipfis thus produced be the outfide fliape of all the long ribs,
the fame as No. 1 is of the fhort ribs. Laftly, proceed to No. 3,
which is for the four hip ribs. Draw the dotted lines from
8, 9, 10, 11, 12 at No. 1 till they cut the diagonal line g b at the
correfponding numbers. From thefe interfediions raife perpen-
diculars at pleafure, as before. Transfer the length of each
8 perpen-
the dome at the infide, and alfo to combine together the hip
and center ribs.
Proceed next to confider the height of the dome as may be
required. Let 7.6 at No. 1 be the perpendicular height of it,
and let m n be the width of the dome. Then draw a femi-
ellipfis to pafs through the points m 6 n, Divide half of this
femi-ellipfis into as many equal parts as it may be thought
neceffary to have ribs in that fpace, which in this example is
fix. Draw on thefe divifions perpendicular lines, as the figure
fliews, and fubdivide the laft fpace, from which raife a perpen-
dicular as before.
Proceed to No. 2, and divide half the length of the dome,
as f 0, into the fame number of equal parts as half the width
was divided into. From the divifions raife perpendiculars at
pleafure. Take the length of the feveral perpendiculars from
No. 1, and place them on the correfponding perpendiculars at
No. 2, and draw a curve line through each point; then will the
ellipfis thus produced be the outfide fliape of all the long ribs,
the fame as No. 1 is of the fhort ribs. Laftly, proceed to No. 3,
which is for the four hip ribs. Draw the dotted lines from
8, 9, 10, 11, 12 at No. 1 till they cut the diagonal line g b at the
correfponding numbers. From thefe interfediions raife perpen-
diculars at pleafure, as before. Transfer the length of each
8 perpen-