LIST OF ILLUSTRATIONS 



Figure 1, 2, 3. Mercurial barometer, with Fortin cistern 4 



4,5,6,7,8. Verniers 5 



9. Tuch barometer cistern 7 



10. Fixed cistern barometer 8 



11. Tube and cistern of naarine barometer 11 



12. Marine barometer and box 11 



13. Funnel method for filling barometers 13 



14. Boiling method of filling barometers 13 



15. Air-pump method of filling barometers 15 



16. Aneroid barometer 21 



17. Goldschmidt's aneroid 22 



18. Dial barometer 26 



19. Sympiesometer ^ 26 



20. Howson's barometer 27 



21. Three-liquid barometer 27 



22. Foreman's barograph 30 



23. Marvin's normal barograph 33 



24. Electric motor mechanisms 34 



25. Compensated siphon barograph, Marvin system 36 



26. Three-piece siphon tube 36 



27. Time marker 43 



28. Richard's barograph 44 



29. Improved barometer box 46 



30. Barometer, cistern, and ring support 47 



31. Old style barometer box 48 



(n) 



