ELECTROMETER.

PLATE CC.

Fig. 1.

Fig. 1: A detailed view of the top of an electroscope. It shows a rounded metal cap (E) resting on a cylindrical body (C, D). Inside the body, there are internal components labeled H, I, K, and M. The base of the body is labeled M and N.

Fig. 2.

Fig. 2: A vertical rectangular metal rod. The top edge is labeled O. The bottom edge has two labels, A and B, indicating its thickness or a specific section.

Fig. 3.

Fig. 3: A small, U-shaped metal component. The top arm is labeled E, the bottom arm is labeled F, and the central part is labeled L.

Fig. 4.

Fig. 4: A long, thin metal rod (needle) with a small spherical ball at the top. At the bottom, there is a small, open, bell-shaped metal cage.

Fig. 6.

Fig. 6: A large, detailed electroscope. It has a long vertical rod with a scale marked from 1 to 10. The top is a knob (C) with a horizontal arm (B) that has a small ball (V) and a contact point (K). A wire (L) connects the top to a small sphere (M) at the bottom. The rod is labeled A, B, and D. At the bottom, there is a loop (E) and a small hook (F).

Fig. 7.

Fig. 7: A diagram showing a central point with numerous small dots radiating outwards in a star-like pattern, representing electrical sparks or discharge.

Fig. 8.

Fig. 8: A vertical metal rod with a spherical ball at the top. A horizontal arm (Q) is attached to the rod, with a small ball at its end. To the right of the rod is a long, thin vertical rod labeled N.

Fig. 5.

Fig. 5: A small, dark, conical or funnel-shaped object.

Fig. 9.

Fig. 9: A complex diagram of an electroscope. It shows a vertical rod (G) with a spherical ball at the top. A horizontal arm (T) with a ball (W) is attached to the rod. Below the rod, there is a circular component with internal plates (P, C) and a wire (N). A small sphere (a) is at the top of the circular part. The base is labeled B and G. To the right, there is a curved line representing a mirror or screen.
A collection of faint technical drawings and diagrams, including a balance scale, a mechanical apparatus with a pulley, and a vertical assembly of cylinders and containers.This plate contains several faint technical illustrations. At the top left is a balance scale with a long vertical arm and a cylindrical weight. To its right is a larger mechanical apparatus featuring a horizontal beam supported by two vertical pillars, with various pulleys and weights attached. Below these are two more diagrams: on the left, a triangular structure with a pulley at the base and a rope system; on the right, a vertical assembly consisting of a top pulley, a cylindrical body, and a bottom container.

ELECTROMETER.

Fig. 10.

Detailed diagram of an Electrometer (Fig. 10) showing its main structure and various components. The main body consists of two vertical columns, M and N, supporting horizontal rods. The base is labeled O and P. Various parts are labeled with letters: F, L, Q, B, E, G, D, S, C, A, R, H, I, K, a, c, l, o, n. A scale is shown at the bottom with markings from 0 to 12.

PLATE CCI.

Fig. 11.

Diagram of a cylindrical apparatus (Fig. 11) containing a vertical rod. The cylinder is labeled with letters A, C, Q, B, D. The rod has a top knob labeled r and h. A small scale or indicator is shown to the right of the cylinder.

Fig. 14.

Diagram of a long horizontal rod with a ball at one end (Fig. 14).

Fig. 13.

Diagram of a horizontal rod with a ball at one end and a vertical rod with a ball at the other end (Fig. 13).

Fig. 15.

Diagram of a vertical rod with a ball at the top and a weight at the bottom (Fig. 15).

Fig. 12.

Diagram of a mechanical assembly (Fig. 12) consisting of a top knob (labeled N°1), a vertical rod, a circular base (labeled N°2), and a small cup (labeled N°4).

Fig. 10.