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Barrow, John [Hrsg.]
Dictionarium Polygraphicum: Or, The Whole Body of Arts Regularly Digested: Illustrated with Fifty-six Copper-Plates. In Two Volumes (Band 2) — London, 1758

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https://doi.org/10.11588/diglit.19575#0169
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j 54 PER

be perfectly understood by you, and yet you rffe It too regularly,
though you may effect fuch things as are within the rules of art,
yet the work will not always be pleafing to the fight,

4. The greateff. painters who have made ufe of it, if they had
rigoroufly obferved it in their defigns, they had much diminifhed
the glory to which they attained, and to which time will give a
kind of immortality.

5. Such as follow its precepts too dofely, may indeed make
dungs regularly true ; but will be very deficient in that harmo-
nious excellency, that exquifite beauty and that charming fweet-
nefs, which would otherwife have been found in them.

6. The architects and ftatuaries of ancient times did not always
find it to their purpofe ; it was not their prudence to trace the
geometrical pare fo exactly as the rules of Perfpectrve do require.

7. If you would imitate the frontifpiece of the Rotunda, ac-
cording to the rules of Perfpective, you would err very much ;
for the columns which are at the extremities have more in dia-
meter than thofe that are in the middle.

8. The cornifn of the palazzo Farnefe, which looks fo beau-
tifully, if beheld from below, yet, being more nearly viewed, is
found to want very much of its juft proportion.

9. In the pillar ot Trajan, the higheff. figures are much greater
than thofe which are below ; which, by the rules of Perfpective,
Ibould be quite contrary: Here they increafe according to the
meafure of their diftance.

10. There is a rule which teaches the making; figures after
that manner ; but it is no rule in Perfpedfive, though it is found
in feme books of that art; and it is never to be made ufe of, but
when it is for your purpofe, viz. when it may eafe the fight and
render the object more agreeable.

11. The Farnefian Hercules, its bafe is not on the level, but
on an eafy declivity on the advanced part; the reafon of which is,
that the feet of the figure may not be hidden from the light, but
appear more pleafing to the eye.

12. And this is the true reafon, that thefe great men have
fometimes flepped afide from the geometrical rules of PerfpecHve,
not in flight or contempt of the art, but for the abfolute pleafing
of the fenfe of fight.

Methods fyf deferibing geometrically figures neceffary in Perspec-
tive. 1. A line, as A B, plate IX. fig. 1, being given to
form a fquare on ; fet one foot of the compaffes in the point A,
and, extending the other the length A B, defcribethe arch B C ;
then, from the point B, defcribe another arch AD, interfering
the former in E ; and from E fet off half the arch E A, or E B,
outwardly, to D and C, to which points, drawing lines from
A B, 8cc, the fquare is formed.
 
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