Langley, Batty, 1696-1751 / The city and country builder's and workman's treasury of designs, or, The art of drawing and working the ornamental parts of architecture
Contents of the fourteen plates of roofs, etc. which are added to the work, p. 
INTRODUCTION. NE great Pleafure that Builders and Workmen of all Kinds.haye of late Years taken in the Study of Archite&ure; and the great Advantages that have accrued to thofe, WI for whom they have been employed; by having their Works executed in a much neater and more magnificent Manner than was ever done in this Kingdom betbre; has been the real Motive that induced me to the compiling of this Work, for their further Improvement. Befides, as the Study of Archite&ure is really delightful in all its Procefs; its Pra&ice is evidently of the greateft Importance to Artificers in general; and its Rules fo eafy, as to be acquired at leifure Times, when the Bufinefs of Days is over, by Way of Diverfion: 'Tis a Matter of very great Sur- prize to me, how any Perf~n dare prefume to difcourage others from the Study thereof, and thereby render them very often lefs ferviceable to the Publick than fo many Brutes. But to prevent this Infe6tion from diffufing its p~ifonous Effluvia's any further; and in Confidera- tion that amongft all Sorts of People, there are fome, in whom Nature has implanted that noble Faculty of the Soul, called REASON, whereby we judge of Ti7'ings: I have therefore, at a very great Expence, compiled this Work for the common Good of all Mm of Reafon, whofe BufindThs require the Knowledge of this Art, and who defire to hecome Proficients therein. The firfi Work to be done in order thereto, is perfe&ly to underifand the Five Orders of Columns, which here I have placed precedent to the Defigns for that Purpofe; and which I peremptorily admonifh be well underftood, before any Proceeding be made to attempt the Art of Defigning. The Five Orders of Columns have their Members fo eafily adjuffed, that the Reader, after having once read their Explanations, need never read them a fecond Time. Nor will their general Propor- tions efcape his Memory, after having pra&ifed them about half a Dozen Times. The Defigns contained herein, and the Orders preceding them, are in general ad by Aliquot Parts; fo that when the Height of any Work to be made, is known, (which in all Cafes muff firit be given) and divided into fome certain Number of equal Parts, as affixed to every Defign; the Heights and Proje&ions of its Members are thereby determined. And, that young Students may not be at a Lofs herein, I have, for their further Inffruetion, (hewn their particular Members, with theirMeafures at large; which the Defigns of Inigo Jones, and all other Maffers to this Time, are defe&ive in, and confequently are of no more Ufe to Workmen, than fo many Pi6tures to gaze at; not fo many Rules1 or Examples to work by, or after; unlefs to fuch, who underifand the Archite&ure thereof, as well as their Authors, who defigned them. I (hail now proceed to explain the Orders in the moft familiar Manner; which will render the Underftanding of all the following Defigns confpicuous to every Capacity. B. LANGLEr. CONTENTS of the Fourteen Plates which are added to the Work. of ROOFS, Plate I. The (plicing or lengthening of Beams explained; a Beam Camber, with an Inch and Quarter Spring, to Z5 Feet Extent; different Truffes for Girders and Beams, different Scarfings for Wall-plates, Raifings, &c. Plate II. Requifites for fquare Roofs explained. Plate III. A fecond Method for fplicing and lengthening of Beams. The Lengths and Angles of the Backs of Hip-Rafters in irregular Roofs explained. The Lengths and Angles of the Backs of THip-Rafters in p~slygonal Roofs explained Plate IV. Circular, Elliptical, &c. Eip-Rafters to o&angular and fpheroidical Roofs explained. Plate V. To lay out a fquare Roof in Ledgement. Pine VI. A fquare double Roof (commonly called an M Roof) in Ledge- meat. Plaz# VII. An oblong double Roof (returned with fingle flips at one End, with an open Gutter, and double hipp'd at the other End) in Ledgement. Plate VIII. A hipp'd Roofin Ledgement having one End fquare, and the other End bevel with a camber'd Flat for a Balcony on its Top. Plate IX. An irregular double Roof in Ledgement. Plate X. Two Varieties of framing irregular fingle Roofs which are hipp'd at one End, and gabled at the other. Plate XI. Two Examples of irregular Roofs in Ledgement. Plate XII. Eight Examples of Trufles for principal Rafters true pitch. Plate XIII. Ten Examples for truffed Roofs. Plate XIV. Se&ions of truffed Roofs, with the Roofs of the Churches of St. Paid',, Co'vern~. Gardei, and Grge,rwicb, with Re~narks.
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