Meteorological Observations. 239 



the brass headings. The closed nature of the cylinder entirely 

 prevents the passage of an explosive atmosphere into the lamp by 

 any current of air ; no swinging of the lamp causes any action on 

 the flame ; and no hlower of gas can blow into the flame, in conse- 

 quence of the protection of the cylinder : all danger also, by reason 

 of the heating to redness of the wire-gauze, is entirely removed. 



Besides the removal of the defects common to the Davy lamp, 

 M. Eloin's lamp possesses, from its structure, some peculiarities that 

 render it much safer. The air which enters through the narrow 

 breadth of wire gauze, below the flame, being only such as is neces- 

 sary to support the flame of the wick, and the combustion being of 

 so perfect a character, that portion of the cylinder which is above 

 the flame must always be filled with the products of combustion, and 

 never with an explosive atmosphere. This is clearly seen by the 

 flame being extinguished whenever the general upward current is 

 by any means reversed. 



The weight of the lamp (always an important consideration 

 where it has to be carried for any length of time in the hand) is not at 

 all objectionable ; and its cost in Belgium does not exceed7 francs. 



A conical brass shade is attached to, and made to slide upon, the 

 rods surrounding the glass portion of the cylinder, by which the 

 light can be directed downwards if wished, so as to throw the light 

 over the floorof the mine.— Newton's London Journal, February 1852. 



METEOROLOGICAL OBSERVATIONS FOR JAN. 1852. 

 Chi&wick — January 1. Hazy: overcast. 2. Overcast : fine: slight rain. 3. Foggy: 

 very fine : cloudy : boisterous at night. 4. Clear and very fine : frosty. 5. Frosty : 

 clear and fine. G. Clear : very fine. 7. Rain. 8. Cloudy : boisterous. 9. Quite 

 clear : overcast. 10. Frosty : clear and fine : rain. 11. Rain : overcast. 12. Con- 

 stant rain. 13. Foggy, with rain. 14. Foggy : rain. 15. Cloudy. 16. Densely 

 overcast : fine. 17. Very fine. 18. Hoarfrost : very fine. 19. Frosty : very fine. 



20. Densely clouded. 21. Fine: rain at night. "22,23. Clear and very fine. 

 24. Rain. 25, 26. Very fine. 27. Fine : rain. 28. Foggy : fine : clear : frosty at 

 night. 29. Foggy and frosty : very fine. 30. Rain : heavy clouds : clear. 31. 

 Densely overcast : rain. 



Mean temperature of the month 39°-66 



Mean temperature of Jan. 1851 ". 40 -07 



Mean temperature of Jan. for the last twenty-six years ... 36 -79 



Average amount of rain in Jan 1-68 inch. 



Boston.— Jan. 1,2. Cloudy. 3. Fine. 4. Fine: hail-storm early a.m. 5, 6. 

 Fine. /. Cloudy: rain p.m. 8. Cloudy. 9. Cloudy : rain a.m. 10. Fine 11 

 line: rain early a.m. 12. Cloudy : rain early a.m. 13. Cloudy : rain p m 14 

 Cloudy. 1 5. Cloudy : rain a.m. and p.m. 16—19. Fine. 20. Cloudy : rain p.m" 



21. line: rain p.m. 22. Fine : rain early a.m. 23. Fine. 24. Cloudy : rain a.m 

 and p.m. 2u, 26. Fine. 27. Cloudy: rain p.m. 28. Fine. 29. Foecy 30 

 Kamy : ram a.m. and p.m. 31. Cloudy: rain a.m. and p.m. 



^anOuiohMmaejOrkney.— Jan. 1. Rain. 2. Showers : sleet-showers. 3. Cloudy 

 Meet-showers. 4. Snow-showers. 5. Rain : cloudy. 6. Rain : showers. 7. Showers' 

 loow-tbowers. 8. Frost: cloudy. 9. Showers : snow-showers. 10. Snow-showers '• 

 Cloudy. 11. Snow-showers : clear : aurora. 12. Cloudy : showers. 13. Showers • 

 -bar. aun.ra. 14,15. Bright : cloudy. 16. Showers : cloudy. 17. Showers' 

 18. Showers i damp. 19. Jlright : clear: aurora. 20, 21. Cloudy : rain 22* 

 Opudy: showers: thunder and lightning. 23, 21. Showers: dear: aurora 25* 

 howers: aurora. 26. Drops : cloudy. 27. Hazy : cloudy. 28. Kne : clear • 

 Im halo. 29. Drizzle: ihowers. 30. Showers : sleet-showers. 31. Showers' 

 thunder and lightning : ihowers, H1 ' 



