MICnOfCOPES. 

 Fi-. 7-36. 



239 



Solar Microscope. (Fig. 757, next page.) This instru- 

 ment in its principle is composed of a tube, a looking-glass 

 or mirror, a convex lens, and a single microscope. The 

 sun's rays being reflected through the tube, by means of 

 the mirror, upon the object, the image or picture of the 

 object is thrown distinctly and beautifully upon a screen of 

 white muslin, placed from five to twenty feet distant, and 

 is magnified to a size not to be conceived by those who have 

 not seen it. The further the screen is removed the larger 

 the object will appear, though it will be brighter if not re- 

 moved too far. The body of the microscope consists of a 

 tube of brass three inches in diameter and ten inches long, 

 having another tube of brass moving easily within, to the 

 end of which the microscopic part is attached ; the other 

 end of the outer tube contains the condensing lens secured 

 in a brass cell ; the body of the instrument is screwed to a 



