1000000030

R T

1 .

C6I1)7rr¡flion

Rov..!ill!

/fa/fllloollJ.

fig .

l .

S~t

olF 50 tudls, from the rc'cntcring .Ingk O

of the counterle... p, un the c,'pital OL of the r.. din,

or on the

p,rp~ndicular

produced, and fro m the pu,", L

tira" I,nes

the

Ihould~rs

A S; whofe pans LM,LN,

w minated by the eountedear\" "ill be the fans

~IO,

0;..1,

the 1t:lIl1'gorges of the r"vdin requi red .

This is

~Ir V,IU~an's

method of cOllll rut\ing m 'clins,

accor,hng to fome aU lhors; .nu Others "ill h" I'< thefaces

of the ravdin tu terminate on thofe of the bullions "ith·

in 3 {Oifts of the OlOuldm; "hieh fecms to be the bell

",ay, for the ralc'

,15

cover the fl.nks much better than

the others

The dilCh before the ravelin is 12 toires, its counter·

fearp pmllel tOIhe faces of the ral'eli n" and is made in

a ei"ulM arc, befare the faliant angle; as like"ife all

diteh,s

~re

in general.

When the rdl'chns are made " ith flanks, as in fig, 3,

the fms nlUuld terminate off thoCe of the balliolls, at

leall 5 wifes from the IllOulJm,

The¡¡.nb are nlade by Ceuing off 10 toiCcs from the

extrcmiues of Ihe fdCes, frum

to h, and fromm

fig, 3, and flom the points h, 1, the Hanks hk, Ip, are

d...vn p,¡ralld to the capital LO of the ravelin.

Thae are Cometimes rcdoubts made in the ravelin, Clleh

as in fig. 2, whieh is

uone

by fwing olf 16

toiCe,

from

the ewemilies of the faces on the femi'gorges from N tO

b, ar,d ftom M to a; ·and from the pointS b, a, the fa·

ces are drawn pm llellO Ihofe of the ravelin: the diteh

before this redoubt is 6 totfes, and its eounlerfearp paral.

the faces,

COIlj/ru{lion of

r moill",

A tenaille is a work made in the dileh befare the eur·

" ins, Ihe parapet of which is only

or 3 fcet higher than

the level grouad of the ravelin, There are three dilfc.

r(OI fans : tlle ur(l ale Ih<le as in Gg, 4, whieh are made

in Ihe dtro¿tion of Ihe Jines uf dcfence , leaving a pallage

of 3 lOil.s Getween lheir txtremitics and the flanks of Ihe

banion" as likewife .nolhcr of 2 in the middle for a

bridte

communicalion

the taI,tIin,

The fecond fort, are thofe as in Gg. 5,Thei r faces arein

the linesof Jtfenee, and 16 tO.rcs long, be/idcs the par.

f,ge of 3 tOif., b((l\,een Ihem and tlle flanks of

Ihe

baC.

tions; Iheir flanks ale fouroJ by deCeribing arcs (t omone

fllOulder of Ihe tenadle as Centre Ihro' Ihe other, on wllleh

are fet

~iI'

10 tOlCtS for 1:le flanks deuled,

And the lhird fon, a,e thoCe as in lig, 6, Thei r faces

are 16 teifes, as in the fecond COr!, and the fl, nks arepa·

ralle! 10 thoCe of the baflion!.

Toe ufe in general of ten. illes, is

defrnd the bOllom

of lhe dileh by a grazing (¡re, as likcwife Ihe le,d ground

of the rarelin, and cfpeeiJlly the diteh before: the re·

doubt \Vidlin the ravelin, whieh can be defeoded from no

\'Ihere elfe Co well as from thcm,

The fidl fort do not d& nd tbe di lch Co well as the

OdlClS, as being too oblique a dcfcnce

but as they are

no: fubjc8

1IJ

he: cnfil,dtd, M. Vauhan has glnnally

prcfcrred themIn the iorlifylng

places, as ""Ybe ftcn

lhe citadel of Lille, at Land"o, New·BnIJe, , ud in a

LI:.I!

m.ny

o,her plJrts.

[he fecoodCOtt Je.tnJ Ihe Jildl much GCUer thJO lue

A T

lirlf, alld add a II)\V flank to thofe of the b.lflions; hU! as

thefe Hanks ale li,.ble tn be enlil."kd, they have not bCllI

mueh pUl in I'r"II,ec, This .fet'elQ IlIigh l ho\Vever be reme·

dleJ, by 1Il,lking thcm lo as

he coveren by the e"tre·

nIltles nI' the pdl apets of the oppolile r'l'ellns, or by fome

other work,

J\'

10 the third

Cort,

they hal'e the fame advan"ge as

th" !crond, ami are likewile li,.hle

Ihe fame obje8lOns;

fol' whieh re,¡(on lhey mdy be "fed with the famepreeau–

tions \Vhieh hJI'e been menlioned in Ihe Cecond ,

Ten"ill,s are d leemed lo nece(fary, that there is hard·

lyaAy place fonified without Ihem; antl it is not wi,hout

real'ln; for when the uilch is dry, the par! behind Ihe

tenaillcs ferves as a place of arms, fromIVhieh the troops

may fally, deHroy the IVorks of lhe encmy in Ihe diteh,

oppofe their defeel;t, and lelire ",ith faf«y ; and theeom–

munieation from the boJy of lhe place 10 the ravelin be·

conles eafy and fecure ; which is a gre.t advantage; for

by tha! means the ravelin may make a mueh beuer de–

fenc<, as it can be fuppliod \l'ith troop5 anu neceil'aries at

anl' lime. i\nd if the diteh is IVet, they ferve as har·

bours for bOals, whieh mal' carry out armed men to op–

paCe Ihe pa(f'ge Ol'er the diteh whenevcr Ihey pleafe; and

the eommunieationfromthe lenailles to the ravelin, be–

comes

like\\'iC~

much eauer lb,to il would be withouc

thelll,

Conj/,u{/iw o{

I."",lIu,

Fig. 7, Lunwes are plaeed on both fides of the ra–

velin, fueh as B,

increafe the Hrenglh 01 a place:

they are eonHru8ed , by bifet\ing the faces of the rave–

lin with the perpendienlar LN ; on .whieh is fet ofr' 3'0

toifes from Ihe eounterfearp of Ihe diteh, for one of ils

faces; the other faee PN . i, found by making the femi·

gorge TP of 25 toifes

Ihe diteh befare lhe luneltes is

12 tOlfes, the parapet 3, and tbe rampan

as in tbe

rdl'elin.

There i, fomelimes another 1V0rk made tO cover Ihe

L,liant angle of Ihe ral'elin; fueh as A, called

BOllnd,

whole (dees are p,,,.lId tOthofe of the ravelin, and

wh~n

prcdueed biCet\ Ihofe of the lonmes ; the diteb beforejt

is 10 toifes,

Tha e are likewiCe luncms, fueh as D, in fig.

whoCe facos are dralVn perpendicular 10 thoCe of Ihe ra–

velin, within a Ihi rd pan

fro~

Ihe faliant angle; aod

th~ir

Cenu.gorges are only 20 toifes,

Thde klnd of wor!ts mal'

m.ke

a good defence, an1

Jre no vcry gre", expence; fo r as they are fa near the

ralelul, the communieation wilh it is very ed fy, and one

eannot IVdl be maint>ined till they are all time taken,

5, Cor.J/rllflioll

rmuillonJ.

Fig. 9, Produce Ihe (ms of Ihe m cJin beyond the

counterfeJrp of Ihe diteh, al a d,llanee !lIN of 30 toifes,

and take on tbe coumer!earp of the grca! di leh 15 toi·

f, s flom the

cntt ring angle p tO

tI>

30<1

draw Nq ; then

q 'Mp will be Ihe ten,illon required; ilS dileh is 12 toi·

les, Ihal is, the: C;lmc as Ihdt of Ihe ravdin, Sometimos

Ih .re is made a retired hanay in Ihe fron! of the te·

nailiuns, as in fig. H; this batlery is '0 lUiC,s from Ihe

fronl

"hich il ISp" , lIel, and 15!Oifes long,

Thut: an:

t 001111111

rtll'clIl:hnH:nls

made

Ihe

te·

n~illulls,

fU'.h

¡"

ü ;

t11c:r

1'.tr,II":tS

ar~

I'.tf,dld

Ihe

j(OIll~