EDD

349

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and ; Protn thence through the window of the room below,,' 3 t prefixed.

let » 0 18 now plain, that by the tackle 1, 2, the shears can beperjjp ®T er as far as necessary, and brought back into then 'ocular; but to counteract this main guy, and keep allthe ofls t le ro pe 5, 6, 7, with a small tackle upon it, performsthe rn u 6 0p an ou t-hawler guy, fixing to the same ring in^Ppart’ as that of the main shears had before done. Thisena ^ e< i the cupola to be hoisted and set on whole“ yi/ 4 a ^ ru >se.

VII .—Plan and description of the work-yard atw ith Us furniture and utensils.i°tt e( j^ re 1. The general plan of Mill-Bay, wherein the‘‘ d "J e a & c shows the line of low-water spring tides,to ^he channel dug from low water to convey vessels« 4 A e f of the jetty fg.

« gj * ^ The area of the work-yard.lon» „ nce the removal of this work, has been built l the

o-room.

« ^ C " The marine barracks.

'< y,. 0, New streets of Stonehouse.line tg^ U r e Plan of the work-yard and jetty, abcd, thelying ’"’gating the head of the channel. Now any vesselshe a j 3 gainst the two large piles b C, on which a pair of4ticl (] e p ein S erected, can be unloaded of her cargo of stone,Jetty ( Q l ^ ere ^ u pon a wheel-carriage; that passing along the'thegQ he turn-rail e, the carriage is there turned round tillthe 68 ^ a ’ r w ' t -h the rail-road e f ; and passing along it, en-w P r h-yard, whose boundary is marked by g g g g.

So 0tl *' s another turn-rail, which enables the carriage tothere a !i ' ts burden ; either in the straight line, or to turn"tic! arr . , go along the rail-road in the middle of the yard,hy a ro n lng at destined point, suppose h, it is there metat t th° arr * a ° e ’ ^ or w b' c h, planks being temporarily laid,he eajii ae burden (being transferred on small rollers) will*ay 8 . ^ ® lov ed thereon to the extremity of the yard side-e, lgewi S p thus stones can be deposited, as at k k (shownr et(j e u Pward) upon any point of the area of the yard,

. " 'ph„ rrie< l by the same means.

18 the p ai j ea bounded by the line G G, and the dotted line l l,“ j( ( j 0rt land workshed.

, Cllr tia» e ei J otes one of the bankers; to which, from the wheel-%la-r p P° Sed on t ' ie ra 'l- ro ad opposite) strong joistshr 0 |j„i’ as ®bown by the dotted lines, the pieces of stonel her e i n , on small rolls; the bankers having notches sunk“la rec eive the ends of the joists.

,to fie w e manner, the area n o was the shed for the moor-“ Th° r ^ ers -

?° rte< l b S< l Uare area p Q denotes the extent of a roof, sup-^Pfesent^ Pour posts, covering the platform; whereof a btk'^ipal V' 16 Platiog 3 of rough stone walls; cd one of itsj ee 'inch”°° r Ambers, 6 by 12; these being covered with°°r, u Planks, and brought to a true level, made a stout

It. 'p, ri w hich the courses were brought together.

S. ^ 16 eabin for the foreman of the yard.

0 IV a'!? 51 '! store-room for tools and iron-work.t , Vv ni, e st ore-shed for Watchet lime and puzzolana.‘a® *. ■ i hi

u 6 P'^zol le s ^ e< l lor bucking orPoa it an a upon w r, the bank

beating the larger parts ofwith three cast-iron beds

Ma/Wc»-> of H,‘he

Hi

er<

“in

® 3. Supposed a detached figure, being the ground-turn-rail at t {Figure 2) to an enlarged scale,

b ‘"oli *isa dormant circle of wood well supported; of

® j, , a ^ s the centre-pin fixed in the transverse beama.'*’!?, j> eia g connecting studs.

^ Itspt j° r ti° n s of the rails, whereon the wheels move, whichn place by the fillets f f nailed on each side.

4 tr

“ G G. The sleepers for supporting the rails at about ayard’s distance middle and middle; as is also shown near e,in Figure 2.

“ Figure 4. The plan of the movable turn-rail, and Figure5 the relative upright; showing also the section of the dor-mant circle. The three last figures having a mutual refer-ence, the same parts are marked with the same letters : andfurthermore, in Figure 4 and 5.

“ h i. The rail part of the turn-rail, correspondent tothose parts marked f f, Figure 3, in width and height. Therail parts, h i, are strongly framed upon the cross-beam K k,and connected by the pieces L L. The whole being poised,with its burden, upon the pin c, but without absolutelytouching the dormant circle A b while turning ; for bearingonly upon the flat shoulder of the pin, it turns easily ; but,when it is bringing on, or wheeling off, the equilibrium uponthe pin being destroyed, the ends, h, i, are then supportedupon the dormant circle, and the wheels will move steady.

“ Figure 7 shows the plan, and Figure 8 the upright viewof the wheel-carriage, to the same scale as that of Figures3, 4, and 5. Also Figure 9, and Figure 10, give the uprightviews of the roll-carriage in two directions, to the samescale; which show distinctly the manner of supporting theaxis of the rolls on iron frames ; and how the iron framesare kept upright by four pair of cross bars.

“ Figure 11. The upright of the capstan-roll, axis, andmiddle part of the bar to the same scale. At 1, 2, is shownthe capstan in full, to the scale of the yard ; and 3, 4, and 5,mark the direction of the rope, which, from a snatch-blockat 5, ascends to the upper block of the main tackle, sus-pended from the top of the shears, as per Figure 6, whereinthe in-hauler guy-tackle is marked 7, being a runner andtackle ; and the out-hauler, marked 8, are simple blocks.The guy-rope, 7, 6, was attached to a ring-bolt, passing jthrough a large rough stone, rammed into the ground ; itsplace being shown at 6, (Figure 2,) the out-hauler guy 8, 9,being secured in the same manner. j

“ The marble rocks, marked 10, go round the point of jthe bay. j

“ Figure 12. The elevation of the upper part of thejetty-head in front, with the shears upon it, to an enlargedscale ; more particularly to show the smaller parts.

“a, b. The front pair of piles, to which the cross-beamC d is bolted, and, in like manner, to each pair of piles.

“ e, e. The ends of the longitudinal half balks.

“ f f. The cross joists.

“ G, G. The ends of the flat rails that the wheels of thecarriage run upon.

“ h h. A single cross timber, serving as a stop to the car-riage at the end.

“ i. The snatch-block.

“ N.B. The scantlings are marked, because this jetty orscaffold, erected as slight as possible for a temporary purpose,sustained the whole tonnage of the Eddystone matter, in andout, without derangement.

“ The detached Figure 13, gives a part of the top of oneof the shear legs, showing how they were plated on eachside, to support the bolt of the anchor from bending, andthereby from splitting the poles.

“ Figure 14. The enlarged figure of the runner and tackle(marked 7, in Figure 6.)

“ K. The runner-block of one large single pulley.

“ l m. The tackle-blocks, of three pulleys each, making apurchase of twelve, equivalent to the great blocks.

“ Figure 15. An upright diagonal view of the main-tackle .blocks ; having six pulleys each upon two pins ; the largertier being ten, and the lesser eight inches diameter. This |