rare and highly sought after early 20th century american industrial double arm "white portable" workbench machinist task lamp manufactured by the o.c. white co. of worcester, mass. the stationary dome-shaped base with pre-drilled mounting screw holes is attached to a threaded end steel pipe, supporting an ornamental cast iron double arm bracket with deeply embossed lettering (i.e., manufacturer markings). the stationary bracket contains two opposed pivoting brackets supporting the patented cast iron knuckle joints, which received many awards and medals (e.g., franklin institute, of philadelphia, the massachusetts charitable mechanics association, of boston, etc.) for its remarkable originality, both in design and execution. the tubular steel arms retain the original wrist joints containing harvey hubbell sockets with matching green porcelain enameled cold-rolled steel shades or reflectors. every joint of the mechanism has an elastic pressure, easily adjusted if necessary, which is sufficient to hold a heavy lamp and shade quite firmly, and still yield to a moderate force when it is desired to change its position. the variety of form as well as the range of motion of these holders is almost unlimited. the key sockets have been rewired with period appropriate braided cloth lamp cord. the o. c. white co. was incorporated in 1895, and began business at 65 beacon street in a very small way with only a few types of adjustable electric light fixtures, under patents originated by dr. otis c. white. suring theirt peak in production the o.c. white company manufactured over one hundred different styles of lighting devices, including a large variety of portable lamps, desk fixtures, desk and table standards, wall brackets, floor portables and other types of fixtures in all finishes for use in business offices, banks, libraries and public buildings of every description, and also a great variety of heavy iron adjustable fixtures for use in machine shops, mills, factories. the company remained for ten years on beacon street and then having outgrown the old quarters, in 1905 removed to the heron street, where they remained for several years.