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Benjamin, Asher, 1773-1845. / The American builder's companion; or, A new system of architecture: particularly adapted to the present style of building in the United States of America
(1806)
Plate 19 [description of stairs], pp. Plate 19-35
Page Plate 19
How -to draw t s a hn. t an u er exevoa&
DRAW a circlefrmteenr ,GIS1 KJ IHabuthead
inches in diameteraddvd h iI i~eneit ih t 't h
eST;:a:i: LfSE K 00 an: I ft g al ths poin::: f t Om the:.c ::' t e0
:-
lines 04, 1 ,5S~2,6,3 -Spoea oi h it c o nd
centre Of the sc
perpend~icular to,o~nwt-hdsai~omkteureoaic
everyrevoltion rqie omkei6rvltosinti col n
lutions thereontirih4 heei fcure ite
lines from eachoftoesxen-isonprlewihoutngG'
3,) 4,, 61, 7,1 8, si,1,1,1,1 n ,a lc n oto h
passes, and extedteohrt nmea-pitwhth
*~~~~~~~a- i oots
them 4wun at onte2d ft id
ci~~1've, dram Y
twist; and ST b
.* S : < . PLATE.
-d aboudat he sc roll of a had il to any nuber of revol
: : 00 RAW a frceiom the centrey, G 's i4 L K Jf IH. about three and
ahl
: C S.; i = me4r, and divide the circuference into eightparts; at
the
;K and H throughallthose points, and fom the cenitrd
;; 0:0liQ O 4oI, ,i2, 6, 3, 7. Suppo~se thaty o is the distance you -intnth
- 0 et ftesroll to be fromn the begining of the twst;
from o dra
; -- eedil to G on o,with the ditace o G. mnake the quarter
of a circlepG
-; \0 Fvsup~oseit ere required tomak two reoutions in this scroll; and,.ic
^00 ;t :-: e~trre~utoncontain8 eight parts,there will, of curse,be: sixteen
in twoceo
-- 0: -0:t? : r e divide the quarter circle pG iflto sixteenl equa
~ rts,adrw
0 i; ?, 7 50-li*s ro~leah f those sixtee~n d1ivisions, parallel ith o
p, -cutting joG at ,2
-fV\ :;0;0 ; 4 5,6, 1 , 10 I, I I, 12, 13, 14 anld I5, aty lc one foot
of the cm
-\ ~eadeend the other to 1 nw G :o ; make a point with
the ot
a - ;t it on I- t i ihe outsideo th e -rail stilk and
< sr ces y2, y3,,4,y5,76,yyyf .1X pick:
ta%
- 0* - t 4~3, 4, S. 6,7, 8, 9,&c. o h ufi~o h raiaL~ +o
7f;Rt;- ~ ~ ~ th linef; a .~lin parallel ~to o, wh:h-sd;tegnfmg
;50ei , tW~; alt aot wo inches from the line oy, tae the di ccinyI
E;\ -sl Q;;0 ;omsw, ndplace oe f~ot at I, on the outideege of*e railanditr
~~~-s f;;00 _:11us*r*s. :..' Q
Jthe scrofllo a hand Hail to any Rnumffofr~ver:
fio m the centre y, G IS 14 L K J, I H. about three and a, half-
,er, and divide the cir"CUierence into eighparts ;'at, theplit
and If throurgh all those points,, ftd om i he:i>, tefiii
,i 2 6, , 7.Suppo~se thaty o is the dstance you -intd the
:roll to be fromn the begining of the twst ; from o drawp
,o G on o~with -the dtaice ~o G, rnake the quarter of a circle p5 G.:
wee requirdid tomak iwo revolutions in this-:scroll, and, Jsince
conta~ins eight parts,there wtl, <0of'ou'rse,be:sixteen n two revo-
edi'*Me the q uare c eG intonste equa tSad dr a~w
of those sixtee~n d1ivi]sions, paallewith o0p, -cutig'-oG 'a;tti.
9, IO, I I, I2,1I3,I4 ald I5,atyplcone foot of the coln-
:end the other to i vnwG :o tXmbe a poit with the foot,
E-: the I Id-usid-ti e -r*X stMl X<
e~s Y 2Sy1 Y 3, d7~ iXti2;t t t $
plicefoo a 4 rdI, -e Fu (£Xi*; .f;~ ien 00
a afi a-,- which it; the, Centre fa0da^::i*xt\ T-:e ;
in the comipas~ses, ploo one fioot U-4\ bxwrod itrethe0lWt0:
h is the centre :for-rwige curve I 2. tbedi
IUM
AW
JF S'
the scrofl a hand to any, number g(revoiua
F1G.
from the Centre y, G I S 14,L K J, I H, about three and
,r and divide the ci 11 umfirence into e.ght parts ;'at, the"
and Ifthrourh all th6se points,, and ftom the: tefiitel'
J.)
Suppose that o is the dista nce yo u inter
21, 6i, 3i 7-
roll to be from the beginning of the twist ; from 0 d
o G on owith -the distance o G, make the quarter of a circl
were required to make i*6 revolutions in this scroll, - and
tontainseightpartsl there*MofCou'r'sebe sixteenin
div-' Me the q circle G'
uarter into teen equal anc
Df those sixteen -divisions, parallel with o 's Cu i
q 101 11, 12, 13, 14 and I 5, at y place one foot of the
end the other to i vnG o mAe a point with th(
the outaide bf th till k**
ces Y -2 Y 3, Y 51
I, 4, 7, 9,
161,' 8
di& -lift 44ar2dl&
y
,it two inches from. the -line, oi, tAe *I*
place one foot at I the
on *6d
r at aj, which is theCentre fat t
in the Couipasses plao one foot At and bxt f
I is the centrejok drawing the curve 1 2. the a
JL J6 4L %-F J6
to'draw the scroll a hand U to' nuer'exevlsofiotj.
F.-I G.
DRAW a circle from the Centre Y, G I S 14,L K J, I H, about three and a,
half
inches in diameter and divide the circumference into e ght pats ;'at, the
pomts
raw
tk-u-- L K J and If through4ltth(ise points, and from the
th
lines 0,, 4s I) Sj 21, 6i, 3i 7- Suppose at y o is the dista nce you intend
the
centre Of the scroll to be from the beginning of the twist from 0 draw
P
perp ndicular to o G on owith -the distafic o G, make the quarter of a circlep
G.
8UPj*ft
itwere required to make i*6 revolutions in this scroll, - an
since
I di
arts e -,*iW of course, sixtmn
contains eight pther in two revo-
Into
ik equa d dr a"w,
lu ffierdiirc- divide the q uarter circle G" teen P=San
allel With 0 CUttjngG'
ethics ftom each of those sixteen Zivisions, par t
61, 7-1 81 9$ 10, ill 1 2 y place one foot of the Coln-
S) 4s S2, 113, 14 and I 5, at
and extend the other to i vn,', mAAe a point with the
fbot
Ion rad
outsiae still
'on I at the- 6f t ftj i6d
x &,Stances 3, y d
8 &
t town at 16,
7i
JJJJV It:11e 2djey
law line aPar 0 0
twist two in
and about ches ftom, the -linestake
IC S.; =4 place one foot at i on the interim
often
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