" A. The landing-place.
• B. The cave in the east side of the rock.
• c. The steps cut to mount the rock to the entry-door.
" D. An iron rod, serving as a rail to hold by, in passing to the flan of the ladder, occasionally put out from the entry door at E.
" No. of the Eddystone lighthouse upon the east and west line, as relative to No. 1, supposing it the low water Qt a spring-6de.
"In the section of the rock, A a shows the upright face or drop, marked with the same letters as No. 1, and the line n e shows the general direction of the grain and slope of the rock to the south-westward.
"The dotted line a b shows the level of the base of the first stone. The black line e d is the base of the stone in the first course that is intersected by the cast and west line ; and e 1 is the level of the top of the first course, and bed of the second; 2, 3, 4, 5, and 6, mark relatively the tops of the six courses that bring the artificial part of the foundation upon a level with the reduced top of the natural rock ; e 6f, being the first entire course, marked Vii. as being the seven th above the ground-joint.
"I The foot of the temporary ladder ; and there is shown the manner in which the ground-joint of the stone-work was sunk into the rock, all round, at least three inches.
"h. The first marble plug, or central joggle, that went through the sixth course, and reached half-way through the seventh ; and so in succession to the top of Course XIV.
" i k. The place of the marble cubic joggles inlaid between each two courses, which were in an octagon disposition round the centre.
"1. Smaller cubes between the fifth and sixth course.
"Course XIV. terminates the entire solid ; as upon it is pitched the entry and well-hole for the stairs. The temporary ladder,/ y, to the entry-door 13, is only put out when wanted; and then is lashed by eye-bolts to the stone ; at other times, having a joint in the middle, it folds, and is laid along in the entry.
"Above the top of the entire solid, the centre stone being omitted to give space i'or the well, the cubic joggles Nu ere of double the number, and half' the size. Course XXIV. ter
minated that part of the building called the solid: and here the habitable of the building began, whereof E is the lower store-room.
"F. The store-room door.• " G. The upper store-room.
"tt. The kitchen.
"1. The fire-place, from which the smoke ascends through the floors and lantern, through a copper funnel, and through the ball.
"H. The bed-room.
" a. The stone-basement of the lantern.
" M. The lantern door into the balcony.
"N. The cupola.
" The ascent from room to room is by the perforations through the middle or key-stone of every floor ; and the detached figures show the means, by inclined step-ladders, removable at pleasure.
111.—Plans of the rock after being cut, and pre pared to receive the stone-building. Showing the six foun dation courses.
"Figure 1. Plan of the rock, as prepared for the stone work, somewhat extended, to show how it applies to Plate 1. The line A a shows also here the place where the surface drops, as specified, Plate 11. No. 2.
" In this figure, Course I. appears in its place, as fixed with its trenails and wedges. The part darker shaded, and marked D D, was not reduced to a dovetail on account of fissures, but was sunk two inches lower than the rest of Course 11. The stones laid therein would therefore be encompassed by a border, and held fast in every direction. The letters E. W. N. S, in all the figures, denote the cardinal points ; the same letters, in every figure, denoting the same pas.
"The part of the rock marked c, rises above the rest by an ascent, or step, of Moen to eighteen inches, according to the line D NOE; which, lying somewhat without the general contour of the building, and affording a firm abutment, the advantage was taken ; and the work of the first and second course carried against it, as shown at o.
" 1, 2, 3, 4, 5, and 6. The level platforms, or steps, for the ditferent courses, whose upper sides are even with these numbers in Plate 11. No. 2 being upon the level of Rud yerd's lowest step.