1851 Great Exhibition: Official Catalogue: Class VI.: Harding, Pullein and Johnson
102. HARPING, PULLEIN, & JOHNSON, Guildhall Chambers — Proprietors.
Patent apyrotype machinery. Self-acting machine for the manufacture of printing type from copper, zinc, or other metal, without heat, by means of dies and powerful pressure; its object is to produce a letter of more exact form than usual; and it is stated that the metal, hardened by the compression to which it is subjected in the process of manufacture, attains a durability estimated at sixty times that of ordinary cast type.
Machine for dressing the letter after leaving the first machine.
Machine for regulating the height of the types, so that, when set up in pages, their faces may be perfectly even.
Other objects contemplated by this invention are economy of type and ink, and greater resistance to pressure.