Word: electronic
(lookup in dictionary)
(lookup stats)
Dates: during 1940-1949
Sort By: most recent first
(reverse)
...call your attention to a misleading statement made in the article "Seeing by Electron Waves" [TIME...
...author of the article says: "Higher magnification requires shortest possible electron waves, hence higher voltage." As a matter of fact the wave length of electrons accelerated by say 15,000 volts is already roughly 50,000 times smaller than that of visible light. According to the information concerning magnification presented in the article the actual improvement gained by substituting electron waves for light is only 50-fold...
...hesitate calling the electron microscope as it is a magnificent instrument. In view of future developments, however, it has to be admitted at the same time, that with respect to its lenses in their present state, no more favorable comparison can be made than with the microscope as it was at the time of Leeuwenhoek...
...What the electron microscope contributes to war research will not be published. But so great an advance is expected that a society of electron microscopists is now contemplated...
Greater magnification is possible because electron waves are shorter than light waves. Highest magnification requires shortest possible electron waves, hence higher voltage. The portable models sacrifice extreme magnification, but R.C.A. gives 5,000 diameters, G.E. 10,000 (compared to 2,000 useful upper limit in the best microscopes using light waves). Both can be "blown up" photographically to give in effect 100,000 diameters or more. The G.E. instrument, developed by Dr. Simon Ramo and Dr. Charles H. Bachman, has a horizontal system, is 52 inches high, operates on a 110-volt light circuit, The R.C.A. model, only 16 inches...