Gravesande, Willem Jacob 's - An essay on perspective

Gravesande, Willem Jacob 's, An essay on perspective

Table of contents

[51.] Remarks.

[52.] Corollary.

[53.] Problem II.

[54.] Remark.

[55.] Problem III.

[56.] Method. II.

[57.] Problem IV.

[58.] Example I.

[59.] Example II.

[60.] Remarks.

[61.] Example III. 48. To throw a circle into Perſpective.

[62.] Remarks.

[63.] Prob. V. 50. To find the Repreſentation of a Point, elevated above the Geometrical Planc.

[64.] Operation.

[65.] Demonstration.

[66.] Prob. VI. 52. To throm a Pyramid, or Cone, into Perſpective.

[67.] 53. To determine the viſible Part of the Baſe of a Cone.

[68.] Operation.

[69.] Demonstration.

[70.] Remarks.

[71.] Problem VII. 55. To find the Perſpective of a Line, perpendicular to the Geometrical Plane.

[72.] Operation.

[73.] Demonstration.

[74.] Method II.

[75.] Demonstration.

[76.] Method III.

[77.] Operation, Without Compaſſes.

[78.] Demonstration.

[79.] Scholium.

[80.] Corollary.

14viThe PREFACE. ing purſued at first, tho’ it requires a little more
Application, does afterwards ſave a great
many Hours Study, in an Art that always
appears difficult enough.

A Painter, in a ſhort Time, may learn this
Work, and make the Rules thereof familiar to
him: And if this Study be repeated from
time to time, for a few Days, he will find
the Benefit thereof, in diminiſhing his Labour
and Trouble.

But, that any one himſelf may ſee what
I promiſe in this Eſſay; take the following
ſhort Abſtract thereof. It is divided into
Nine Chapters: The Firſt, being as an In-
troduction to the reſt, ſhews the Uſefulneſs
of Perſpective, and gives you the Definiti-
ons of the Terms neceſſary for underſtanding
this Treatiſe.

The whole Theory is contain’d in the Se-
cond Chapter: Where, what has been found
moſt uſeful in that Matter, is therein re-
duced to Three general Theorems; viz. the
firſt, ſecond, and fourth: All the reſt is de-
duced from them, by way of Corollary. To
theſe Theorems, already known, are added
ſome new ones, ſerving for the Demonſtra-
tion of ſome neceſſary Propoſitions. Perhaps
it might be wiſh’d, that I had ſhewn the Way
that led me to the Truths which I diſcover:

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