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LAYING OUT THE SUNDIAL HOUR LINES - Page 11

THE POLAR SUNDIAL PLATE VI The plane of the polar sundial is parallel to the axis of the earth, and if produced, would cut the celestial pole. The diagram shows the construction of the hour lines for any latitude. The GNOMON is usually made in the form of a flat rectangular bar, or in the shape of a pin, and is perpendicular to the face of the sundial. The STYLE points to the celestial pole and is parallel to the face of the sundial. The SUBSTYLE is the 12 o'clock line and lies in the plane of the meridian. The HEIGHT OF THE STYLE is measured in inches and is determined by the size of the sundial. It is usually placed about 2/ to 3 inches above the face of the sundial. The HOUR LINES are parallel to the substyle. The Construction: Draw the horizontal line AC. At B, on AC, erect the perpendicular line BE (This will be the 12 o'clock line and the substyle). Make BD equal to the desired height of the style. With D as a center and the radius BD, describe the arc FBG. Beginning at B, divide this arc into equal parts of 15° each, on both sides of the line BD. From D draw lines through the points found on arc FBG, until they cut the line AC. From the points thus found on

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