9i6 



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 14 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 Une 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. 



