SUNDIAL SECTIONS:

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History of Sundials

Why the Sun Dial keeps time

Developing and Making Sundials

Sundial Materials

Sundial Hour Lines Lay out

Sundial "Furniture"

Declination Lines of Sundials

Portable Sundials

Interesting Sundials of the World

LAYING OUT THE SUNDIAL HOUR LINES - Page 8

The Construction Draw the horizontal line FAG (This will be the 6 o'clock line). At A draw the line AC perpendicular to FAG (This will be the 12 o'clock line). Draw AD so that the angle CAD is equal to the height of the style, or 41 °30'. From B, on AC, draw BE perpendicular to AD. Make BC equal to BE; then make FA and AG each equal to AC. Draw lines FC and CG. Through B draw a line parallel to FAG, cutting FC at L and CG at M. Through L and M draw lines LK and MH parallel to AC. With radius BC and centers at F and G, describe the arcs PQ and SR. Divide these arcs into equal parts of 15 ° each. Draw lines from F and G through the points thus found, until they cut the lines LK and HM, respectively. From A draw the required hour lines through the points found on LK and HM. The hour lines transferred to the sundial plate and the way in which they are numbered. The position of the sundial when in use. Hour Limitations Except for a few months in summer, between the Equinoxes, the sun will not shine upon this sundial between the hours of 6 in the morning and 6 at night. This sundial is generally found only on pillar sundials; therefore it would not be necessary to inscribe the hours between 6 a.m. and 6 p.m.

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