direct-writing recorder

direct-writing recorder

[də¦rekt ¦wrīd·iŋ ri′kōrd·ər]
(engineering)
A recorder in which the permanent record of varying electrical quantities or signals is made on paper, directly by a pen attached to the moving coil of a galvanometer or indirectly by a pen moved by some form of motor under control of the galvanometer. Also known as mechanical oscillograph.