Fig. 3.
Fig. 4.
[Fig. 3] will show the arrangement of lenses and disc in the tube. The lenses are to be an inch and three-quarters from edge to edge; the disc is to be an inch from the eye-lens. Now get a tinman to make you a cap of thin brass plate (like [Fig. 4]). This is to fit tightly on the end of the tube over the eye-lens, and is to have a hole in the centre of the top three-eighths of an inch in diameter.
Now the eyepiece is finished, and we will get on with the stand.
Fig. 5.
Let two circular pieces of beech five inches in diameter and one and a half inches thick, each to have a hole bored in the centre an inch in diameter, and going right through the wood. Take one of these pieces, and on the under side fasten, by three strong brass hinges that work stiffly, three legs, made of inch and a half square pine ([Fig. 5]). These legs are to be four feet six inches long.
Fig. 6.