Fig 5. 



F g. 6. 



METHOD OP DETERMINING THE BOILING POINT. 



THE THERMOMETER. 



1. Heat. 2. Sensible heat 3. Latent heat. 4. Contraction and dilatation. 



5. Liquefaction and solidification. 6. Vaporisation and Condensa- 

 tion. 7. Incandescence. 8. Combustion. 9. Temperature. 10. 

 Conduction. 11. Radiation. 12. Some bodies are pervious to heat. 

 13. Some reflect heat. 14. Means of measuring the degrees of heat, 



15. Mercurial thermometer. 16. Preparation of mercury. 17. 

 Selection of tube. 18. Formation of bulb. 19. How the tube is 

 filled. 20. Scale applied. 21. Graduation of scale. 22. Zero 

 point. 23. Standard points. 24. Freezing and boiling temperatures 

 \miversally adopted. 25. Fahrenheit's scale. 26. Centigrade. 27. 

 Reaumur's. 28. Increase of volume of mercury. 29. Uniformity of 

 its dilatation. 30. Standard thermometer. 31. Range of scale. 

 32. Why mercury is employed in thermometers. 33. Self- registering 

 thermometers. 34. Alcohol thermometers. 35. Air thermometer. 



36. Differential thermometer. 



1. HEAT is one of the physical agencies upon which the well- 

 being of organised nature in general, and of the human race in 

 particular, is most essentially dependent. The instruments, 

 therefore, which have been contrived for indicating and measuring 

 its quantity and degrees have great interest and importance, 



LARDNER'S MUSEUM OF SCIENCE. L 145 



No. 75. 



