| Jan. | 1 | and 0 | May | 2 | Sept. | 6 | ||
| 1800 | 2 | Feb. | 4 | and 3 | June | 5 | Oct. | 1 |
| 1900 | 0 | Mar. | 4 | July | 0 | Nov. | 4 | |
| 2000 | 6 | Apr. | 0 | Aug. | 3 | Dec. | 6 | |
CHAPTER XXXV.—HOW TO MAKE A SUNDIAL.
By F. Chasemore.
I.—THE HORIZONTAL DIAL.
A very useful and instructive pastime for boys will be found in the construction of a sundial, full directions for making which I give in this chapter.
Fig. 1.
[Fig. 1 enlarged] (112 kB)
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The first thing to be done is to make what is called the dialing scale ([Fig. 1]). It is constructed as follows: With a pair of compasses describe the circle A B C D with any radius, say four inches. Draw the two diameters A C and B D, cutting each other at right angles in the point 0. Join D C for the scale of chords and B C for the scale of latitudes. Through the point B draw the straight line 12—6 parallel and equal to the line A C, and let the point B bisect it. Join the points 0—12 and 0—6, cutting the circle in the points E and F. Now divide the arcs E B and B F each into three equal parts, and from the point 0 draw straight lines through these points of division to the line 12—6, marking the points of intersection 12, 1, 2, 3, 4, 5, 6. This line is called the line of hours.