Handbook of Nature-Study 



measures 42 27'. Then the board should be cut off at the line vw, 

 and later the edge sw may be cut in some ornamental pattern. 



To make the dial Take the painted board 1 4 inches square and find its 

 exact center, y. Draw on it with a pencil the line A A" a foot long and one- 

 fourth inch at the left of the center. Then draw the line B B" exactly par- 

 allel to the line A A" and a half inch to the right of it. These lines should 

 be one-half inch apart which is just the thickness of the gnomon. If the 

 gnomon were only one-fourth inch thick, then these lines should be one- 

 fourth inch apart, etc. 



With a compass, or a pencil fastened to a string, draw the half-circle 

 A A' A" with a radius of six inches with the point C for its center. Draw a 

 similar half-circle B B' B" opposite with c' for its center. Then draw the 

 half -circle from D, D', D", from c with a radius of five and three-quarter 

 inches. Then draw similarly from c' the half-circle E, E', E". Then draw 

 from c the half-circle F, F', F" with a radius of five inches and a similar half- 

 circle G, G', G" from c' as a center. 



Find the points M, M' just six inches from the points F, G; draw the 

 line J, K through M, M' exactly at right angles to the line A, A'. This will 



A" B" 

 The face of the sundial. 



