Detail drawings -- typical floor plan of elevator showing alteration in skylight, roof plan of elevator shaft showing steel work, steel diagram at floors; plan of hatchway doors, door A, door B, hatchway frame, section, hinges, angles, connections; miscellaneous iron work -- straps, beams, columns, Van Dorn hangers, angles, lock bar, manhole, channels; plan & section of sidewalk lights, plan at top of cast iron frame for sidewalk lights : No. 11. - Columbia Digital Library Collections