Willson, Robert Wheeler, 1853-1922 · Boston, New York Ginn & company · leaf 18
are determined foreach observed point upon the path of theshadow, and noted against the correspond-ing time, in the note-book (to avoid con-fusion, it is convenient to make a separatefigure for the morning and afternoonobservations, as shown in Fig. 6). Wehave thus obtained a series of valueswhich… … Fig. 6
Astronomy
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