View of fhe
great Ä
Feet. Inches.
'* Height ofthè same '■ ' - i0
* Length of tlie |>ièfs bf m â s n & ÿ 4 * t *;'
‘ Breadtlf o f t f i e p îfe fS t -" H ‘ S ' o "
* Width of tloeWfor embrhiftirns 1 H
! Depth of recess, - - t v *
‘ Height of recess , ; - 8 0
‘ Width of the embrasures H H H j 0
‘ Height of the embrasures •..- 4; 0
“ The1 dimensions- of the parapets, embrasures .Sind
“ loopholes, are as in the first tower;
“ The embrasures or ports ip each, -of the rooms,
“ and the recesses for those of the second, story;, j>are all
“ arched.
“ The coins of the doorSj windo.ws, ports, enihriasur®,
“ and many of the salient angles and staircases in-Tlfe
“ towers, as well as the broad bases or stone foundations
“ of the towers and intervening wall, are of a strong
“ grey granite, with little mixture 6fmica in it,
“ The rest of those buildings consist of bricks of a
“ bluish colour. They are laid in laminae o f a brick
“ thick each; forming, as it were, so many distinct walls
“ as there are bricks in thickness, They differ in their
“ dimensions according To the situations in which they
“ are placed. Those in the front of the wall and towers,
“ are as follow:
Fait. Inches.
, 8 ‘*.Thickn#sJ6f ih e b flA s . v , - | .us-fSb!tsllN
•;>“ W idth dfcthe-saitafe. • jj
■,-y.'Length! ' - - pPp »or lb. & •
“ Those for the ferrates o f the. wkli ahd differ
‘ only from the former i©d5eiirg!^wfet,d\V^quhfei ; ellA
‘.side.containing fifteen inches( ,-Whereyer,-for finjiMk
‘ ing-.-the tapering parapets, b ric k s^ f the
‘ usual dimensions would not apsweri ipstnad o f rudely
I chipping off these to the form required9 as 'has been
‘ sometimes directed by negligent-or ignorant artists-,
'qpare was taken to mould other-bricks purpo&elyobthe
| fbrtn and sme proportioned to'Oaehf separate use; The
‘ cement or mortar between the different layers- of fedbki
‘ Was upwards of half apbuch in thicko^fn and h jd a
| - yiry- small proportion b f Atty ingredieftt in' ifo
‘ the perfect whitone^-ef the cnlcined jimtstone?* *r
“ The blue colour »of the bricks , led tO idoubt whether
|th e y had hoe» exposed to any.greater than the spns
‘ common heat, tho' they had sp>fl©ngpresisted the in--
‘ fhienee of time amdAveathef, It has been ascertained
* b y experiment, that a mass of clay qr> brick contracts
‘ in its dimensions when exposed to the action :of fire;
• and that this contraction is increased? in p r^ o rtio n as
‘ the heat augments; but that the mass does not return
| to its former dimensions after being withdrawn from