BURNING GLASS.

PLATE CALL.

Fig. 1

Fig. 1: A diagram showing a conical lens with parallel rays entering from the left and converging at a focal point on the right.

Fig. 2

Fig. 2: A diagram showing a conical lens with parallel rays entering from the left and converging at a focal point on the right.

Fig. 3

Fig. 3: A diagram showing a circular lens with parallel rays entering from the left and converging at a focal point on the right.

Fig. 4

Fig. 4: A diagram showing a lens system with rays entering from the left, passing through a lens, and then through a circular aperture.

Fig. 5

Fig. 5: A diagram showing a lens system with rays entering from the left, passing through a lens, and then through a circular aperture.
A large, detailed drawing of a portable burning glass. It consists of a large rectangular lens mounted on a decorative frame, which is supported by a tripod stand. The stand has a central vertical post and three legs extending outwards.

Fig. 6

Fig. 6: A diagram showing a cross-section of a lens assembly. It includes a lens, a frame, and a handle or adjustment mechanism.

Fig. 7

Fig. 7: A diagram showing a tall, thin, conical lens or telescope structure.
Fig. 8: A diagram showing a cross-section of a lens assembly with various internal components and labels.

Fig. 9

Fig. 9: A diagram showing a square frame with four corner supports or mounting points.
Fig. 10: A diagram showing a cross-section of a lens assembly with a central lens and surrounding frame.

Fig. 10

Fig. 11: A diagram showing a large, flat, rectangular plate or screen mounted on a frame. The frame is supported by a tripod stand, similar to the one in Fig. 1.

Fig. 11

A blank, aged page with a light beige background, showing numerous small brown spots (foxing) and faint, illegible markings near the top edge.This image shows a blank, aged page with a light beige or cream-colored background. The paper has a slightly textured appearance. There are numerous small, irregular brown spots scattered across the surface, which are characteristic of foxing or water damage. Near the top edge, there are some very faint, illegible markings that appear to be bleed-through from the reverse side of the page. The overall appearance is that of an old, unused document page.

BURNING GLASS.

PLATE CXLII.

Fig. 1.

Diagram of a convex lens focusing parallel light rays to a point.

A diagram showing a series of parallel horizontal lines representing light rays entering from the left. These rays pass through a convex lens and converge at a single point on the right, representing the focal point.

Fig. 2.

Diagram of a concave lens diverging parallel light rays.

A diagram showing parallel horizontal light rays entering from the left. These rays pass through a concave lens and diverge as if they were coming from a point on the left side of the lens, representing the virtual focal point.

Fig. 3.

Diagram of a circular lens with focal points and optical center.

A diagram of a circular lens. Parallel light rays from the left converge at a point labeled 'F' on the right. The optical center is labeled 'O'. The distance from the optical center to the focal point is labeled 'f'. Points 'A', 'B', 'C', and 'X' are marked on the lens's circumference.

Fig. 4.

Diagram of a lens focusing light onto a circular object.

A diagram showing a lens on the left focusing parallel light rays from the left onto a circular object on the right. The object is labeled with points 'A' and 'B'.

Fig. 5.

Diagram of a lens focusing light onto a circular object from a different angle.

A diagram similar to Fig. 4, but with the lens and object positioned differently. The lens focuses light from the left onto a circular object on the right, labeled with points 'A' and 'B'.

Fig. 7.

Detailed diagram of a large optical instrument on a tripod stand.

A large, detailed diagram of an optical instrument. It features a large rectangular viewing screen mounted on a horizontal cylindrical base. The base is supported by a three-legged tripod stand. Various adjustment knobs and levers are visible on the top and sides of the instrument. Labels include 'S', 'T', 'V', 'O', 'Q', 'R', 'M', 'N', 'X', 'Y', 'Z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'K', 'L', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'.

Fig. 8.

Diagram of a mechanical component with adjustment knobs.

A diagram of a mechanical component, possibly a bracket or a part of the instrument's base. It has two vertical adjustment knobs labeled 'S' and 'T' at the top. Below them are several adjustment screws and a central pivot point labeled 'O'. The base is labeled 'V'.

Fig. 9.

Diagram of a vertical optical element with multiple focal points.

A diagram of a vertical optical element, possibly a lens or a prism. It has a long, narrow shape with multiple focal points or adjustment points labeled along its length: 'G' at the top, followed by 'B', 'A', 'M', 'L', 'O', 'N', 'F', 'K', 'H', 'E' at the bottom.

Fig. 11.

Diagram of a cross-shaped mechanical component.

A diagram of a cross-shaped mechanical component. It has a central horizontal bar with a vertical bar crossing it. There are adjustment knobs and screws at the ends of the arms. Labels include 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'.

Fig. 12.

Diagram of a square frame with corner points.

A diagram of a square frame. The four corners are labeled with letters: 'A' at the bottom-left, 'B' at the bottom-right, 'C' at the top-right, and 'D' at the top-left.

Fig. 6.

Diagram of a large platform with a grid surface.

A diagram of a large, adjustable platform. It has a rectangular base with a grid pattern on top. The platform is supported by a complex metal frame with various adjustment mechanisms, including a large screw and a lever. Labels include 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'.

A blank, aged page with faint pencil sketches of architectural structures and a compass rose.This image shows a blank, aged page with a light beige or cream color. The paper has a slightly textured appearance with some minor discoloration and small spots, characteristic of old paper. Faint pencil sketches are visible across the page, suggesting a design or architectural drawing. In the upper left corner, there is a faint circular mark, possibly a compass rose or a seal. The sketches appear to be architectural plans or elevations, with lines and shapes that are not clearly defined. The overall impression is that of a preliminary or working drawing on a historical document.
Fig. 1.
Fig. 1: A large, ornate, circular burning glass mounted on a decorative stand with a central column and a wide, curved base.
Fig. 2: A large, oval-shaped burning glass mounted on a decorative stand with a central column and a wide, curved base. To its right is a vertical frame with a horizontal crossbar.
Fig. 3.
Fig. 3: A large, oval-shaped burning glass mounted on a decorative stand with a central column and a wide, curved base. To its right is a small, vertical frame with a horizontal crossbar.
Fig. 4.
Fig. 4: A technical diagram showing the optical properties of a burning glass. It depicts a lens with light rays converging to a focal point.
Fig. 5.
Fig. 5: A technical diagram showing the optical properties of a burning glass. It depicts a lens with light rays converging to a focal point.
Fig. 6.
Fig. 6: A technical diagram showing the optical properties of a burning glass. It depicts a lens with light rays converging to a focal point.
Fig. 7.
Fig. 7: A large, oval-shaped burning glass mounted on a decorative stand with a central column and a wide, curved base.
Fig. 8: A technical diagram showing the optical properties of a burning glass. It depicts a lens with light rays converging to a focal point.
A blank, aged page with significant yellowing and water damage, showing faint, illegible markings.This image shows a blank, aged page with significant yellowing and water damage. The paper has a mottled appearance with various shades of yellow and brown, particularly concentrated in the upper right and lower left areas. There are faint, illegible markings scattered across the surface, which appear to be bleed-through from the reverse side of the page. The overall texture is slightly rough and uneven, characteristic of old paper.
Fig. 1.
Fig. 1: A large circular burning glass mounted on an ornate four-legged stand. The lens is divided into four quadrants by a cross-shaped frame. A vertical rod is positioned in the center of the lens.
Fig. 1: A side profile diagram of the lens in Fig. 1, showing its curved surface and the internal frame structure with various labeled points.
Fig. 2.
Fig. 2: A large elliptical burning glass mounted on a four-legged stand. To its right is a side profile diagram showing the lens's curvature and the internal frame structure with labeled points.
Fig. 3.
Fig. 3: A large elliptical burning glass mounted on a four-legged stand. To its right is a side profile diagram showing the lens's curvature and the internal frame structure with labeled points.
Fig. 8.
Fig. 8: A detailed optical diagram showing light rays converging to a focal point. It includes a lens, a frame, and various points labeled with letters like A, B, C, D, E, F, G, H, I, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z.
Fig. 6.
Fig. 6: A side profile diagram of a lens with a curved surface, showing its internal structure and labeled points.
Fig. 6: A perspective view of a lens, showing its curved surface and the internal frame structure.
Fig. 5.
Fig. 5: A diagram showing three different lens shapes: a biconvex lens, a meniscus lens, and a planoconvex lens, each with labeled points.
Fig. 4.
Fig. 4: A large elliptical burning glass mounted on a four-legged stand. A beam of light from a fire on the left is shown converging to a focal point on the right. The lens is divided into four quadrants by a cross-shaped frame.
Fig. 7.
Fig. 7: A detailed diagram of a burning glass mechanism. It shows a lens mounted on a frame, with light rays being reflected and focused. The diagram includes various points labeled with letters like A, B, C, D, E, F, G, H, I, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z.
A blank, aged, cream-colored page, likely an endpaper or flyleaf of a book. The page shows signs of wear, including faint smudges and discoloration, particularly along the left edge and bottom.This image shows a blank, aged, cream-colored page, likely an endpaper or flyleaf from an old book. The paper has a slightly textured appearance with some minor discoloration and faint smudges, particularly along the left edge and bottom. There is no text or other markings on the page.
A blank, aged, cream-colored page, likely an endpaper or flyleaf of a book. The page shows signs of wear, including numerous small dark specks (dust or foxing) and faint smudges. The right edge indicates the binding area.This image shows a blank, aged, cream-colored page, likely an endpaper or flyleaf from an old book. The paper has a slightly textured appearance and shows signs of wear, including numerous small dark specks (dust or foxing) scattered across the surface. There are also some faint, larger smudges or stains, particularly towards the bottom and right edges. The right edge of the page is slightly darker, indicating the binding area. The overall tone is a warm, off-white or light cream.
A blank, aged, cream-colored page, likely an endpaper or flyleaf of a book. The page shows signs of wear, including faint smudges and discoloration, particularly along the right edge.This image shows a blank, aged, cream-colored page, likely an endpaper or flyleaf from an old book. The paper has a slightly textured appearance with some minor discoloration and faint smudges, particularly along the right edge. There is no text or other markings on the page.
A blank, aged, cream-colored page, likely an endpaper or flyleaf of a book. The page shows signs of wear, including faint smudges and discoloration, particularly along the top and bottom edges.This image shows a blank, aged, cream-colored page, likely an endpaper or flyleaf from an old book. The paper has a slightly textured appearance with some minor discoloration and faint smudges, particularly along the top and bottom edges. There is no text or other markings on the page.
A blank, aged, cream-colored page, likely an endpaper or flyleaf of a book. The page shows signs of wear, including creases, discoloration, and small brown spots. A vertical strip of light blue material is visible along the left edge.This image shows a blank, aged, cream-colored page, likely an endpaper or flyleaf from an old book. The paper has a slightly textured appearance with some minor discoloration and small brown spots, characteristic of old paper. A vertical strip of light blue material is visible along the left edge, possibly a binding or a piece of tape. There is no text or other markings on the page.
Embossed circular seal of the Advocatorum Bibliotheca.An embossed circular seal is centered on a brown, textured book cover. The seal features a laurel wreath surrounding a central sunburst or starburst design. The Latin text "ADVOCATORUM" is arched across the top, and "BIBLIOTHECA" is arched across the bottom, with small dots separating the words.