1000000030

R T

lo e1ch pJ..ce of arms 're tl\'Of,l/y pons z,

7..

whieh

?ore 10 vr 12 Icet I\'l(le, f" r tile lro,.ps

1..I1y

OUt ; io

tillle 01'

liege Ihel

.lre

¡hut up. mrll

Irriers or

g,IteS,

10.

r.••

¡lru{u..

,/rrln"J ond

/).lJeA,,¡

florl' l/hIJ.

arrelV is a \\',,; k IIldue bdorc Ihe lall,lot

ao.:l~~

Ihe gl,cis. rueh as

fig.

3, ;

It is ellmpofeu

par a,

f' t of

t0ir,s IhiLk••uJ 40 ¡"ni( ; aod ,the

eI"d.

belore

roires. termio.llIug in a Ilupe ar burh ,·nds. The

comlllunic.uion rrum

th(:

COHIt

w..

illto

the(e

3rrows

lUi[es \\'ide. , nd rh<te is • tr;¡veile r at Ihe en,

moee of

lUdes

tluck,

",.Ih a pa/rJge

ur 8 fcel

rou"d i,.

dmlehed redoubl is

k,n,1

work mueh like a

Tl'elio, with the flallks pl..ed

¡'eyuo~

lile gldclS ; lueh

<lS

hg. B:

they are 1Il.IJe

111 ,I!'lb

lO U':LUpy

[ufue

¡'POt

<lf ground whieh might be auv,or ageous lo

Ih~

befiegm ;

Hewire to oblige Ihe enellly

opeo thell Irendles fdr'

Iher oH thao t!,ey " ould do otherwr[e.

Their ulllaoee from

tll~

eu' ert·w<y oughr not to

e~ ,

ued 120 loi[es, IlIat it m, )' be defeoded by mulktt /1101

{rom Iheoee.

The gorge ab is 40 loifes. Ihe flanks ac, bf, ",hieh

~re

perpeodicul.r to Ihe gorge 10. aod the faces ed, fd

So; Ihe dileh belore il is

10'fes, endlOg in flopes at

Wt" eods; Ihe eoven way 4; the branehes of the co·

.ert' ~·ay

are 42 lUir"s loog, or thereabouls;

Ih~

races

uf Ihe plam of anns y,

whieh are perpendicular

(he braoehes, 10 ; and the otha,

whi~h

is parallel

tbem,

14,

The communication from the eOI·err·way iOlo the re·

1I0ubt, is

lOi[es wide; and there is a araverfe made

iun at Ihe enllanee; aod anolher in the middle when it is

rrmy long.

he par'pets of this communic<lion termi·

Dale io aflope or

gl~cis.

Ir theCe edoubl5 are Rbove

toi[es diflanl from Ihe

covert·way, the befiegers carry their trenehes rIluod. and

eoler through the gorge; by which the Iroops Ihat are

rhem are made pri[oners of war. if Ihey do not relire

hetimes;

preveot this, fome other outll'orks Ihould be

made to fuppon them.

11.

C'JI¡fl" ,flion

Smnd Dilehu , ond C.v"l ·wo)'f ,

Fig.· 4. When the grouod is low, and woter 10 be

fouod, there is oflen a drteh of aboul lo or 12

,oife~

made round tile glacis : and oppofi te tO the plaees of

.rm, m eonff ruéled lunelles. beyood the ditch: [ueh

\Vho[e br<ad,h on Ih. counrerCcarp o[ Ihe ditch is

to loires, from b lO a, and from c 10 d; and Ihe raCtS

a.L, dL, are paralld to Ihore 01Ihe places o[ .rms; the

dlleh before Ihem is fruOl 8 10 Itn lOile! wide .

The feeond covm·way is 4IOife!. the [emi. gorges of

Ihe places of arms, m, aboul

15,

antl the

f~ces ptrpen~i·

eular lO Ihe counler[carp

dIe [eeunJ glaris js from

18 loires broad.

This feeootl oovert·way has Iraverres every wbere, in

the f'memaoner .s Ihe fidl.

12.

C',njlruf/iM

Pr.!lu .

. Plale LXXXV . fig.

A pr olile is Ihe repl'ef"lIIa.

1100 of a I'eniea l [d uon of • work: it [en'e,

fl,ew

Ihore dimenfioos wh,ch caooul

rcprefcol ed in

p¡~ns,

aod are oecdr",y in d,,; hu'¡dJIIg of • for.lllic.lllon; Ihey

.a:e

2rnerally ronfl ruélcd upon a fe,le of 30 rw

. u

V. OL.

11.

1\0.

¡:,

A T

ineh.

wonld be need lcfs 10 do:fcriSe

. 11

their paniru.

lar dimen(¡ons. fin ce Ihey He m<rked

the

Ichcm~s

; IVe

-ihalllherefore lay down rhe

pnnc~,.11

rules ooly, giveo by

Vanban. on rhis [nhj,tt.

l. E"ery work ongh!

llt

le.1I

f<el higher Ihan

tlm before il, lo Iha¡ it n"y comOlanrl Ihole hdore it ;

Ilwl', Ihal the garri[on may r,re /rom ,I/ Ihe

work~

Ihe rame time, wlth gre"! anel

[111111

arms . "' Ihe

t.:fi,~

gers io their

arpr~aehcs,:

ontwithllaoding this I¡recion!

pretence, there,are [everal author., wlto objd l ' g.,ioll ir.

For they [ay, if you c<n dlCcover theenemy '-roOl all Ihe

~vorks,

Ihey can dlfeovc,'. by Ihe r.IOle rea[on, all the

wor~s

from their haneri.,; (o Ihat Ihey OIay denroy

IhemwllhoUI being obllged to ehange their fil Ualioo, and

thm by difmouonlJ lhe

g"OS

of the pldee before Ihey

come near

¡l.

Hut i[ all Ihe work6 \Vere of Ihe{ame

hei~hr,

Ihofe

"lithin caOOOI be dellroyed, till fueh 1I00e as tho[e be.

fore Ihelll are laken; &"ns nllght be plaeed in Ihe

00-

rcrt-w.y and outworks

ohllruc1 the eoemy's ' pproaeh.

and I'.'heOIhey come near the place, Ihey might beuanf.

poned into Ihe 100er,works; and as the body of Ihe

place would be mueh 101Vel, tbe expence would be con.

fiJmbly diminilhed.

RUI when worl<s are 1011'.

th~y

are eafily enfiLlded by

Ihe rieoehet batreri.., whlch is a kind of firiog wilh a

[mall quanrily cif powder, by giviog the gun 'n elevalion

of lo or 12 degrees : this mighl however be partly pre–

vented. by making Ihe parapels ne.. Ihe fallan! aogles,

for Ihe [pace of 8 toifes

eaeh fide,

higher

lhan Ihe rell of Ihe work,.

2. The coven·way lhould be lower thao Ihe level·

grouod. otherwife the body of Ihe place mui! be raiCed

fery high, erpecially ,. heo Ihere are fel'eral oUlworks';

this is

be undedload ooly when Ihe works exeeed each

olher iD height, otherlVi[e il neeu nOl

below the le–

vel.

3. The bares of all inward flopes o[ canh lhould be at

lealt equal to Ihe height. if 001 more.

4. The bares of all oUlward flopes of eanh, I\VO thirds

o[ Iheir heighls.

The flopes of all wal/s or revetemems lhould be

one fi fl h of Iheir height; but one (¡xlh would be [ufli·

eienl in our opioioo : Ihe height of a wall is cllimaled

froOl the bOllomof Ihe dilch, and DOI [mm ·the begio–

ning of its founuatioo.

The flopes o[ all parareis and Iraver[es are one

fi xth of Iheir brcadth ; Ih.1is, 3 fcet lowards the field,

or the infide, \Vhere the baoquwes fhould be, 3 feet

higher Ihan Ihe oUlfide.

7. When the re,element of a rampan goes quire up

10 Ihe topo 4 fw of Ihe uppcr'parr rs a vmic.1 \Vall of

fee t Ihick, with a [qlme 1I00e

the rop of it. pro

jeéliog

inehes, aod a circular one below. or IVhere

the fl"pe begin., of 8 or 10 inehes di.mmr ; they go

qui le round Ihe rampan, and Ihe circu lar

plOjeL~ioD

e,llIecllhe

eorclM.

\Vhore the II r.ighl pan of Ihe wal/

en~s

and Ihe Oupe

begins, Ihe IVall is . Iw. ys

m.de

feel Ihiek; aotl Ihe

countel rom or hunrefl;'s reaeh no IlIgher tI:an Ihal pldce.

7. When lhe Idmp'" is pml y WJlkd, .nJ p:cnly IIlrf•

6 1t