[Siphon form on Fourth Avenue: IRT Brooklyn Line]
Photograph of 8'5" diameter wooden siphon form for pouring concrete on Fourth Avenue, Brooklyn of the IRT Brooklyn Line. The camera is on the east side of Fourth Avenue looking west. The image also shows a construction worker, pedestrians, children, and storefronts.
1915
[Siphon form on Fourth Avenue: IRT Brooklyn Line]
Photograph of 8'5" diameter wooden siphon form for pouring concrete on Fourth Avenue, Brooklyn of the IRT Brooklyn Line. The camera is on the east side of Fourth Avenue looking west. The image also shows a construction worker, pedestrians, children, and storefronts.
Worker posing with a siphon form during construction on the BMT Fourth Avenue line, near 13th Street, July 2, 1915.
The 8'5" wooden scaffold was used for pouring concrete.