DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.62828#0603
( 435 )
manner proceed with the projection of A, as fliewn in the figure.
To the fummits of thofe triangles draw lines from the feveral
heights and projections of each member. If the cornice to be
drawn is to be one third lefs, then divide any one fide of the
triangles into three equal parts, and take one part from o to p,
and let fall a perpendicular from p; and from where this per-
pendicular cuts each line draw parallels, which will give the
height of each member in exaCt proportion. For the projec-
tions : o q is one third of the fide of the triangle, as before;
draw a parallel line at q, which will give the feveral projections
fought. Take q t, and transfer this to p r, and fo of the reft,
till you have laid on each projection ; after which let fall per-
pendiculars, as fliewn at No. 7, and proceed to draw the out-
lines of each member within their proper fquares, and the cor-
nice will be contracted in the moft accurate manner.
I
Of enlarging Cornices.
Suppose now the cornice A is required to be higher than
what it is at prefent. Draw parallel lines from each member,
and having fixed the compaffes to the height propofed, fix one
foot at 0, and move the other till it touch any where on the line
a k, as at k• draw a line from c to k, and where this line inter-
feCts with each parallel before drawn, will be the feveral heights
3 I 2 of
manner proceed with the projection of A, as fliewn in the figure.
To the fummits of thofe triangles draw lines from the feveral
heights and projections of each member. If the cornice to be
drawn is to be one third lefs, then divide any one fide of the
triangles into three equal parts, and take one part from o to p,
and let fall a perpendicular from p; and from where this per-
pendicular cuts each line draw parallels, which will give the
height of each member in exaCt proportion. For the projec-
tions : o q is one third of the fide of the triangle, as before;
draw a parallel line at q, which will give the feveral projections
fought. Take q t, and transfer this to p r, and fo of the reft,
till you have laid on each projection ; after which let fall per-
pendiculars, as fliewn at No. 7, and proceed to draw the out-
lines of each member within their proper fquares, and the cor-
nice will be contracted in the moft accurate manner.
I
Of enlarging Cornices.
Suppose now the cornice A is required to be higher than
what it is at prefent. Draw parallel lines from each member,
and having fixed the compaffes to the height propofed, fix one
foot at 0, and move the other till it touch any where on the line
a k, as at k• draw a line from c to k, and where this line inter-
feCts with each parallel before drawn, will be the feveral heights
3 I 2 of