Période

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A study of the mechanism of the flame propogation in the cylinder of a internal combustion engine is being made at the U.S. Bureau of Standards for the National Advisory Committee for Aeronautics circ...
UMG21A21_021

A study of the mechanism of the flame propogation ...

Magic lantern slide circa 1900
UMG20B22_324

Magic lantern slide circa 1900

Christian missionaries posing
UMG20B19_089

Christian missionaries posing

Magic lantern slide circa 1900
UMG20B22_330

Magic lantern slide circa 1900