Apparatus used at the laboratory at the C & NW RR's i.e. Chicago and North Western railroad's, 40th Street yards for analysing solutions of metals used in locomotives and the railroad plant, in general, Chicago, Ill.

Apparatus used at the laboratory at the C & NW RR's 40th Street yards for analysing solutions of metals used in locomotives and the railroad plant, in general, Chicago, Ill.

Laboratory worker at the research laboratory at the C & NW RR's i.e. Chicago and North Western railroad's 40th Street yard, examining paint samples used on freight cars and coaches of the railroad, Chicago, Ill.

Locomotive lubrication chart in the laboratory of the Chicago and Northwestern i.e. North Western Railroad. The laboratory assistant in foreground is working at a precision balance. Chicago, Ill

Nitrogen determination apparatus, part of research conducted during World War II by the Tennessee Valley Authority and the University of Tennessee, 1942

Laboratory worker at the research laboratory at the C & NW RR's 40th Street yard, examining paint samples used on freight cars and coaches of the railroad, Chicago, Ill.

Bureau of Standards speeds up photomicrography with new apparatus. Washington, D.C., Aug. 18. By means of this new apparatus just designed by the metallurgical divisions of the National Bureau of Standards, it is now possible to make 700 micrographs per working day of the structural effect of corros

General view of sugar testing laboratory

Hump master in a Chicago and Northwestern i.e. North Western railroad yard operating a signal switch system which extends the length of the hump track. He is thus able to control movements of locomotives pushing the train over the hump from his post at the hump office; Chicago, Ill.