American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 66
uth point of thehorizon. As in the horizontal dial the eleva-tion of the pole was equal to the latitude ofthe place, so in this it is the complement ofthe latitude. The sun never shines twelvehours on this dial, except when it is in theequinoctial, because the plane itself lies in theprime… … choice of for the east and west line, or the hourline of six oclock; from A let fall the perpen-dicular A F, for the 12 oclock line; then withyour compasses take 60° from the scale ofchords and draw the arc B C VI; then takethe complement of the latitude of your placefrom the same scale, and lay it…
Clocks and watches
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