1852.] 



SCIENTIFIC INTELLIGENCE. 



45 



ity sliding in the metal, tlie right extremity in the agate, h hiss, 

 piece of brass attached to the pendulum-rod, so as to touch the bridge 

 and cany it from side to side. In the diagram the apparatus is not 

 acting. Suppose, however, that the right hand extremity of the bridge 

 touch the gold stud in the agate disc, tlicn tlie current passes, the coil 

 of wire in the pendulum-bob becomes magnetic, and ia carried to tho 

 left by the action of the bar-magnets. In so doing it slides the bridges 



off the gold stud, and thereby cuts off the current from itself, and loses 

 magnetism. It returns to the right by its own weight, but in so doing 

 it replaces the right end of the bridge on the gold stud, and thus res- 

 tores the current to the wire and renews its magnetism ; and so on ad 

 infinitum. Strictly speaking, the e Iges only of the disc should be 

 shown ; they are represented as if seen a little obliquely from above, 

 for the sake of indicating the grooves more distinctly." 



monthly Meteorological Register, at Her Majesty's Magnetical Observatory, Toronto, Canada West.— Angust, 1852. 



Latitude 43 deg. 39.4 min. North. Longitude, 79 deg. 21 min. West. Elevation above Lake Ontario : 108 /«rf. 



Sum oj the Atmospheric Curreid, in miles, resolved into the four Cardinal 



North. West. South. East. 



1022.92 340.60 877.06 733.92 



Mean veloeily of the wind - - 3,30 miles per hour. 

 Maximum velocity - - - - - 18.8 miles per bour,liom lOtolla.m. on 27th 

 Most windy day - - - - - 27ih ; Mean veloeily, 8 39 mile.i per hour. 

 Least windy day ----- 1st ; Mean veloeily, 1.19 ditto. 

 Most windy hour ----- 1, p.m. Mean velocity, 6.25 ditto. 

 Least windy hour - - - - -10, p.m. Mean velocity, 1.27 ditto. 

 Mean diurnal variation ^ - - 4 98 miles. 



A considerable number of shooting stars observed on the nights of the 10th, 

 nth, and 12ih August. 



The column headed " Magnet" is an attempt to di.stinguish the character 

 of each day, as regards the iVeqiiency or extent of the fluctuations of the 

 Magnetic deciinaliun, indicated by Ibesclf-registeringinslrunienls at Toronto. 

 The classificaiion is, lo some extent, arbitrary, and may require future 

 modification, but has been found tolerably definite as lar as applied. It is as 

 follows : — 



(ra) A marked absence of Magnetical disturbance. 



(i) Uniniporlant movements, not to be called disturbance. 



(c) Markfd disturbance— Whether shewn by frequency or amount of 

 deviation from the normal curve — but ol'no great importance. 



(d) A greater degree of disturbance- but not of long continuance, 



(e) Considerable disluibance — lasting more or less the whole day. 

 (/) A Magnetical dii^turliance of the first class. 



The day is reckoned from noon to noon. It two letters are placed, the first 

 applies to the earlier, the latter to the later part of the trace. Although the 

 Declination is particularly referred lo, it rarely happens thai the same terms 

 are not applicable lo the Horizontal Force also. 

 Thunder Slarms. — 4ih, distant ihnnder, at 2 p.m. 

 5th, distant thunder, at 2 p m. 



14lh, thunder, lightning, and rain, from 11 a.m. to midnight. 

 I9th, sheet and (orked iighlning, 9 to 10 p.m. 



241h, thunder, lightning, and rain, from 2—20 to 3 p.m. 



26th,ihunderslorm— ceased 7-10 A,H, Thunder, Iighlning, and rain, at 3 p,m. 

 Highest Barometer - - 29,955, at S .\.M., on 16ih ? Monlhly range : 

 Lowest Barometer - - 29 310, at 10 P.M., on 4ih ^ 645 inches. 

 Highest observed Temp. - 81,2, at 2 P.M., on 19ih ? Monthly range: 

 Lowest regisl'd Temp. - 45.8, at A.M., on 2nd S 35,4 



Mean Highest observed Temperature - - 72 59 j Mean dailv range: 



Mean Registered Minimum -56,83 J 15.77 



Greatest daily range - - - 24.9 from 2 P.M., of 15lh, to 6 A.M., of 16lh. 

 Warmest day - - 23rd - - Mean Temperature - 72 92 J Diti-r^-nee : 

 Coldest day - - - 2nd - - Mean Temperature - 57.38 J 16.84_ 



The"IM[eans" are derived from six observations daily, viz., at 6 and S, 

 A. M., and 2, 4, 10 and 12, P. M. 



Compai-ati-ve Table for Ane^ast. 



