Abstract: An improvement in carrying heat away from the drum in a thermographic duplication apparatus. The drum is formed of two concentric shells, the outer being only a segment of a cylinder.

Abstract: An apparatus for duplicating information from a master provided with information, such as text lines or the like, comprising a drum rotatable in a stand, to which drum the master is applied, and the master during rotation of the drum is exposed to directed heat radiation from one or more heat radiators and supplied to a dye-carrier rotating synchronously with the drum, which carrier comprises a dye-carrying web, the dye of which adheres to the master in agreement with the information applied thereon, unprepared copy receiving sheets are then contacted with the master and subsequently removed therefrom.