. The American journal of science and arts . e south during the day,but the evening was unusuallycalm. The thermometer stoodat 26°. Early on that evening,streams of light shot up in thenorth as usual, but were princi-pally confined near the half past 8 oclock a brightarch was formed which rose tothe height of about 40°. Itwas well defined, and extend-ed to the horizon on the eastand west. This arch exhibitedthe appearance of segments orsections of circles, of differentdiameters, all of which wereperfectly united. This appear-ance continued about fifteenminutes, when the arch becameb
. The American journal of science and arts . e south during the day,but the evening was unusuallycalm. The thermometer stoodat 26°. Early on that evening,streams of light shot up in thenorth as usual, but were princi-pally confined near the half past 8 oclock a brightarch was formed which rose tothe height of about 40°. Itwas well defined, and extend-ed to the horizon on the eastand west. This arch exhibitedthe appearance of segments orsections of circles, of differentdiameters, all of which wereperfectly united. This appear-ance continued about fifteenminutes, when the arch becamebroken into sections, and grad-ually disappeared. The fol-lowing diagram which I made at the time, will afford a tolera-ble idea of the form of thearch during its continuance. In conclusion I would re-mark, that so far as I have ob-served, the aurora borealis gen-erally occurs in cahn weather,and in summer it is almost uni-versally the precursor of thun-dev storms, and in winter, otsnow and boisterous weather. Faycftcvilic Vl. May 2L 264 Thermomeirical Register. o ir- 8 OG^ eN-5 0^5^ 5^ ^ g ©^ r- GO G* G^ -rt- Ol a> CO Ci to £- GO O CD GO G^ o GO o i> G >< -* ^ ^ •^ ^J^ o o ^ O Tt* ^ f^ O «^ Tf GO Tl^ CO , 1 O o CO o o G< G o G< o G O r- G^ G^ G-0 ^ O T-l GO O G^ as i!^ CO |t- 1 > 5> O Gt ^ CO i> O C5 O s> UU ^ i^ O ^ o Ci C5 o * GO o o> GO •^ ^ GO GO GO sf GO sf nH CJ l-H ^ GO r- cr> 1—1 ^ CT> LO t- o -J * G^ G 1—1 CO Oi o Ci CO o o O G^ o 1—1 GO T—1 G* 1—1 Oi —1 O O lO lO lO lO O o -* lO T—1 ^ r- m 1—1 rn o TtH G^ to o a s> G^ ^ CO Ci 1—1 o o GO G^» o cu ^ GO o rn G» o Ti^ G< ^ 00 G^ o O ^ kO O o o O to lO to O) o o o o ?^ r- r^ Ci o Oi tx G<« in -H Tf G^ ^ ou o O Ci CO o CO rf CO Ci 1> 5:- o t- ?O >« o o t- to to . ^ G* G> r- o T—1 G) <o CO T
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