2oS Observations on the Direction and Iniensifi/ of the [Arnit 



A few days after my arrival at Miulras, having completed the obser- 

 vations of Class I., I despatched the cylinders in a banghy parcel ^orCachin, 

 where they were met by Mr. Caldecott, for the purpose of making the 

 observations which follow. In comparing the times of performi\ig 100 

 vibrations at Tvivandrum now observed, with those obtained when I left 

 there, it appears that the Cylinder T. G. T. No 1, had diminished its in- 

 tensity* by about 6 seconds, and No. 2 had diminished 1,2 secondsi- in 

 performing 100 vibrations; a circnrastance which could only be expect- 

 ed, on considering the rough usage to which, in all probability, parcels 

 are subjected by the banghy runners ; such however is not the case with 

 the other cylinder (No. 3), nor with J. C. Nos. 1 and 2; these last no 

 duubt owe their invariableness to the rough usage to which I had pre- 

 viously subjected them — having performed at once what otherwise 

 woald have been performed by degrees.— In addition to the two cylin- 

 ders J. C. No. 1 and No. 2, Mr. Caldecott had now constructed a third : 

 which appears to have arrived at a fixed state of intensity ; since, dur- 

 ing 27 ilays (in which observations of this class were being made) its 

 intensity diminished only 0, I9s. for 100 vibrations : this cylinder dif- 

 fered from the other two, in its length only ; a circumstance which arose 

 from its extreme brittleness, by which one end (about ^ an inch) broke 

 off, in polishing, after it had been tempered. 



* It issotucwliat curious, although quite accidental no doubt, that 



s 



No. 1 has lost altogether 20,68 in performing lOQ vibrations. 



2 20,27 



3 20,54 



* This decrease of intensity in No. 2 is I think rather chargeable to other causes 



