A Description of Helioscopes, and Some Other Instruments

Table 1 original: Tab. I

Figure 1.

A diagram of a rectangular box showing the paths of light reflecting or refracting between internal points, marked with the labels a, b, and g.

Figure 4.

A partial diagram located at the top right, showing a tapered structure and the paths of light rays within it.

Figure 6.

A diagram of a box showing internal light beams crossing one another, labeled a and b.

Figure 3.

A diagram illustrating a long, thin rectangular box labeled a and b, likely representing a tube or optical casing.

Figure 5.

A long horizontal diagram representing a light-sealed chamber or tube—similar to a camera obscura—with light rays converging toward the right side. Internal labels include c, a, and a.

Figure 11.

A detailed mechanical drawing of an articulated arm assembly. This sophisticated device features a screw-clamp at the base for securing it to a surface, multiple pivot joints for flexibility, and a terminal assembly equipped with a pointer and a disc. Labeled components include f, d, g, c, and o. This likely represents a mount for precisely positioning a telescope or helioscope.

Figure 13.

A partial diagram on the right side showing a vertical mechanical component with a central circular element labeled 5, and other parts labeled b and 2.