Fig. 46. NACHET'S MULTIPLE MICROSCOPE. 



THE MICROSCOPE. 



CHAPTER III. 



30. Oblique plane reflectors. THE SUPPORT AND MOVEMENT or THE OBJECT : 

 31. The stage. 32. Mechanism for focussing. 33. Coarse adjust- 

 ment. 34. Fine adjustment. 35. Method of determining the relief 

 of an object. 36. Difficulty of bringing the object into the field. 37. 

 Mechanism for that purpose. 38. Mechanism to make the object 

 revolve. 39. Object to be successively viewed by increasing powers. 

 40. Slides to be cleaned. 41. Compressor. 42. Apparatus for apply- 

 ing voltaic current. THE ILLUMINATION OF OBJECTS : 43. Curious effects 

 of light on objects. 44. Illumination by transmission and reflection. 

 45. Microscopic objects generally translucent, or may be made so. 

 46. Effects of varying thickness. 47. Varying effects of light and 

 shade. 48. Uses of the Lieberkuhn. 49. Effects of diffraction 

 and interference. 50. Use of daylight. 51. Artificial light. 52. 

 Protection of the eye. 53. Pritchard's analysis of the effects of 

 illumination. 



LARDNER'S MUSEUM OF SCIENCE. 

 No. 110." 



33 



