Printer's illustration blocks illustrating a series of electron micrographs of the intima of blood vessels
Klischograph half tone block engraving machine K150 serial No.04122559, c. 1955, with samples of Nolar foil plates used with machines Klischograph half tone block engraving machine K150 serial No.04122559 1955
Two tapered brass pulley blocks; one with three pullies and one with two pullies; with cord. Two tapered brass pulley blocks 1762
Radiograph through steel block 4.43" thick (mounted photo and diagram) Photo, radiograph through steel block 4.43" thick 1926
Two frames each containing 2 blocks of 3 pulleys each, in brass, with cords. Two frames each containing 2 blocks of 3 pulleys each
Hardwood Blocks (various specimens of turning), by Holtzapffel and Company, London, 1843-1884 Hardwood Blocks (various specimens of turning) 1843-1884
Two tapered pulley blocks each with 3 pulleys and 2 hooks Two tapered pulley blocks each with 3 pulleys and 2 hooks 1752