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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
(1756)

Introduction,   p. [2]


Contents of the fourteen plates of roofs, etc. which are added to the work,   p. [2]


Page [2]

        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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