LEVELS. Plate CCXII. This plate contains 13 detailed illustrations of surveying instruments, each labeled with a figure number and a lettered key: Fig. 1: A spirit level with a horizontal bar and a small vial at one end. Fig. 2: A long, cylindrical spirit level with a central support. Fig. 3: A spirit level with a vertical scale and a bulbous vial. Fig. 4: A long, vertical spirit level with a base. Fig. 5: A tall, vertical spirit level with a base. Fig. 6: A spirit level with a vertical stem and a bulbous vial. Fig. 7: A small, triangular spirit level. Fig. 8: Two small, flat spirit levels. Fig. 9: A spirit level with a curved, graduated scale. Fig. 10: A spirit level with a vertical stem and a circular vial. Fig. 11: A cross-shaped spirit level with a vertical stem and a circular vial. Fig. 12: A small, T-shaped spirit level. Fig. 13: A large spirit level mounted on a tripod stand. Fig. 14: A vertical ruler with a horizontal crossbar. Abell Prin. Nat. sculptor fecit. A large, faint, rectangular watermark or impression is centered on the page. It appears to be a library stamp or a faded illustration, possibly depicting a building or a landscape. The watermark is composed of several horizontal and vertical lines, creating a grid-like structure. The overall appearance is very light and translucent, blending into the aged, yellowish paper. There are some small, dark spots and stains scattered around the watermark, particularly near the top and bottom edges. Fig. 1. Fig. 2. Fig. 3. Fig. 4. Fig. 5. Fig. 1 Fig. 2 A technical drawing of a horizontal beam or shelf. It features a central rectangular cutout. The cutout is divided into three vertical sections by two internal vertical supports. The entire structure is supported by a base at the bottom. A technical drawing of a horizontal beam or shelf, similar to Fig. 1. It has a central rectangular cutout. The cutout is divided into three vertical sections by two internal vertical supports. The entire structure is supported by a base at the bottom. A technical drawing of a horizontal beam or shelf. It is a solid, rectangular structure with a flat top surface. A technical drawing of two small vertical supports or brackets. They are positioned on either side of a central horizontal line. Each support has a vertical stem and a horizontal base. A technical drawing of a horizontal beam or shelf. It features a central rectangular cutout. The cutout is divided into three vertical sections by two internal vertical supports. The entire structure is supported by a base at the bottom. Fig. 1. A geometric diagram showing a vertical line MM' intersecting a horizontal line AB at point N. Dashed lines m and m' extend from N upwards and downwards respectively, representing the optical axis of a telescope. LEVELLING. Plate CCXCIV. Fig. 2. A perspective drawing of a leveling instrument. It consists of a horizontal telescope tube AB mounted on a vertical support MY which is attached to a cylindrical base VV'. The base is mounted on a rectangular platform CD. The telescope is labeled A at the left end and B at the right end. The support is labeled M and Y. The base is labeled V and V'. The platform is labeled C and D. Fig. 3. A geometric diagram illustrating the leveling process. It shows a curved line segment AC with points N, P, Q, R, and S marked along it. A point O is located below the curve, and a point T is at the bottom. Lines connect O to N, P, Q, R, and S. A horizontal line XYZ passes through N, P, Q, and R. A vertical line VD is shown, with V on the horizontal line and D on the curve. A dashed line TV connects T to V. The diagram illustrates the geometric construction used to determine the level of the ground. Fig. 4. A geometric diagram showing a curve segment with points C, D, B, and A. A straight line CB is tangent to the curve at B. A line CA is drawn from C to A. A line DB is drawn from D to B. The diagram illustrates the geometric construction used to determine the level of the ground. Fig. 1. 1823 This figure is a topographic map showing a landscape with contour lines and various survey points. It is divided into three sections: Fig. 1, Fig. 2, and Fig. 3. Fig. 1 is a small inset in the upper right showing a cross-section of a hill with points A, B, C, and D. Fig. 2 is a small inset in the lower right showing a cross-section of a hill with points A, B, C, and D. Fig. 3 is the main map showing a large area with contour lines, a river, and a settlement. The map is labeled with various letters and numbers, indicating survey points and elevations. This figure is a profile view of a landscape, labeled Fig. 5. It shows a cross-section of a hill with a road or path running along it. The profile is labeled with various letters and numbers, indicating survey points and elevations. This figure is a topographic map showing a landscape with contour lines and a settlement. The map is labeled with various letters and numbers, indicating survey points and elevations. The settlement is shown as a cluster of buildings, and the contour lines represent the elevation of the surrounding terrain. This figure is a profile view of a landscape, labeled Profile, Fig. 7, and Fig. 8. It shows a cross-section of a hill with a building on the left. The profile is labeled with various letters and numbers, indicating survey points and elevations. The building is shown as a small structure with a roof and windows. Abt. Brühl, Haldenburger, 1807. A winding river or path flows from the top left towards the bottom right. In the middle ground, there is a large, somewhat indistinct structure that could be a building or a bridge. The background features rolling hills or mountains. The entire illustration is very faded and has a slightly grainy texture. There are several small, brownish-orange spots scattered across the page, likely due to foxing or age-related staining. The overall appearance is that of an old, weathered document.