-  P. E. Chase on Mechanical Polarity. 95 
Whatever cause effete at the same instant the magnetic and . 
aérial currents should first manifest itself through its influence 
intervals of six hours, so arranged as to facilitate a comparison 
with the magnetic declination, I find in each year, from 1844 to 
1847 inclusive, that at one hour before the observation of the 
wind (and in each year except 1846, at the hour of observation) 
there was a greater average westerly WS by EL when the wind 
was nearly east than when it was nearly his is shown 
by the following table, which embraces all the tabulated in- 
stances when the wind was E. by N., E., E. by S., or S.S.E., 
or S. 
The Gaidion of declination is alta s | by a 
ing from the observed declination the m onthly mean at thes 
hour ; 2d, subtracting the monthly average of is daily wea 
from the: mean variation of the day; and 3d, subtracting the 
latter result from the former. One scale division of the decli- 
hometer =0'-711. Increasing g wester- 
ly declination. 
Silica 
E. by N., E, or E. by S. {| $.3.E., 8. by E., or 8. 
i oars. pag 7 Sage 
g | £28 533 E | 333 
¥ 2 Soz 338 3 S23 : 
ear. z 5 = : ee 3 36 —_ 2s 
ee tae OR eRe ch BW sh) ay Lk 
63 S.a4 4 ie 4 6s S28 > 
a "3 4 en ole | Fa. dares FO tn: 
1844 | 1] -611 —46 | -1066 =97 gL b+ 42970 406) 
1845} 10 | -3- Seg ee —05 || 988 | -1828 | -06 
1846 | 90 | -116 | -06 | +437 | +22 || 191 | + 678 | +08 
1847*, 8 —4:96 a a} —15 + 1°52 +12 
Total,| T26 | 1439 [11 | -1976 | —16 || 567 | = 621 | —ol 
_ The — experiments of Marcus, showing the direct conver- 
of heat into electricity, (see London Chemical News, No. 
286. Journal of the Franklin — No. 478,) t the a 
n atmospheric daily cycles, with two maxima an 
minima of of letra Pane ar and the tendency of aye — 
are all ieee in this nae 
* Jan to July inclusive. com- 
” For pa late i interesting observations upon atmospheric sey, src 
Bice °f De. A, Wilts ts the, Tames code erage. 
The long series of observations at ee nt 
siting mae sot onto ete 63, table lvi. 
