E.C. Delafield house.
15 East 40th Street. E.C. Hunt, Jr., at work.
[Man working with scientific equipment.]
[Man working on a camera lens.]
Mr. E.C [Edward Collins] Knight [Jr.]
[C.M. Sorensen & Co. Inc. vacuum pump.]
[Camera factory.]
[Street repair.]
[Interior, camera store.]
[Hunter College.]
Hunter College, laboratory.
LIRR shop. Train repair