Celejlial and Terrestrial Globes. 263

dows of his two strings always united inone distinct shadow, that his observation maybe compleat, when his assistant gives thedefinitive signal.

If this be repeated four or five times, avery accurate meridian line may be obtain-ed, and may be drawn on the window,the floor, or a pavement, by their shadowwhen united by the fun’s rays, and theplumb lines mav be occasionally suspendedfrom two fixed hooks, when you chuse toobserve the passage of the stars a-crofs themeridian.

For the use of the curious it will not beimproper to observe, that the late Dr.Bradley found that the distance of the starmarked « at the extremity of the tail of thelittle Bear, from the polar point, was 2 deg.

1 min. 39 sec. on the first day of January,A. D. 1751, old stile > at the fame time itsright ascension was io° 45' 15" equal to43 min. 1 fee. of time; and as the rightascension increases 1 min. 16 fee. every tenyears, its right ascension may be obtainedfor any succeeding year; and having thefun’s right ascension in time also, subtractthe last from the first; by adding 24 hours

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