Phenolic tube circuit assembly with octal tube base plug
National Bureau of Standard, U.S. Department of Commerce
||Scratched into tip of base
||Scratched into side of cylinder
overall: 1 1/2 in x 1 1/2 in x 7 3/4 in
Object is a phenolic resin cylinder of unknown contents. it is secured with small screws to an octal vacuum-tube type of base.
Gift of David Hartsig