Proceedings of the British Association. 



221 



Rev. T. Rankin's additional Thermometrical Observations in a 

 deep well at Huggate. The well is 348 feet in depth : — 



December 9th, 1844, top of well . 

 „ 150 feet deep . 



„ 300 feet deep . 



water at bottom 



March 11th, 1845, 



April 5th, 1845, 



April 23rd, 1845, 



. top of well . . 

 150 feet down 

 300 feet down 

 water . . . 



. top of well . . 

 100 feet deep . 

 200 feet deep . 

 300 feet deep . 

 water . . . 



. top of well . . 



100 feet deep . 



200 feet deep . 



300 feet deep . 



water . . . 



June 3rd, 1845, . . . top of well . 

 „ 100 feet down 



„ 150 feet down 



„ 200 feet down 

 „ 300 feet down 



„ water . . . 



The average of these five was — of the shaft 

 „ „ of the water 



38 



degrees 



> at 4 p. 



M. 



42 





j> 





45 





» 





43 





» 





32 



degrees 



, at 6 5. 



M. 



38 





» 





44 





n 





43 





» 





50 



degrees 



, at 2i i 



. M 



45 





» 





45 





» 





43 





» 





42 





» 





59 



degrees 



, at 2 p. 



M. 



55 





» 





50 





j» 





47 





» 





45 





» 





70 degrees 



, at 1 p. 



M. 



65 





it 





60 





» 





55 





» 





52 





» 





46 





?> 









. 4?08 







. 43-8 



* On the Baron de Bode's Insulated Compass/ by J. Y. Oliver. — 

 The object was to insulate the compass from the action of the iron of 

 the ship. The contrivance was this : a double glass bowl, the 

 intermediate space being filled with mercury, was made to act as the 

 bowl of the ordinary compass. It was hung in gymbals, and pro- 

 tected with lead. This rendered it very heavy and cumbrous. 



Mr. Dent objected, that if this insulation would protect the needle 

 from the action of the ship's iron, it would also shield it from the 

 directive force of the earth, and therefore render it useless : but upon 

 placing a poker near the compass, it was distinctly affected through 

 the insulating mercury. 



