PEATE 1 
Seidel and Winter 
Smithsonian Report, 1944. 
E 
ceciemateaeieeieees 
amin THPEEE a eS 
HEL 
f 
RINT 
LE ib 4 
LPI 
Wiitieay. 
R.C. A. TYPE B ELECTRON MICROSCOPE BESIDE A LABORATORY MODEL OF THE 
DESK TYPE ELECTRON MICROSCOPE. 
