An electron microscope for practical laboratory service

Direct observation of extremely minute objects is of great value to both science and industry. Consequently a great deal of time and effort has been spent developing and perfecting optical instruments for making such observations. The modern light microscope is capable of rendering visible detail which is as fine as 0.00002 centimeter. Since the limit of resolving power of the normal eye is between 0.01 and 0.02 centimeter, the maximum useful magnification with these instruments is 1,000 to 2,000 diameters. Where ultraviolet light is used, the useful magnification can be increased to about 3,000 diameters.