D'Arsonval's galvanometer D'Arsonval's galvanometer (Siemens) Davy lamp De la Rive electric egg Demonstration apparatus for Hertz's experiments Demonstration galvanometer Densimeter Despretz - d'Arsonval galvanometer Despretz's apparatus for the propagation of the heat Diffusion pump Direct vision spectroscope Discharge tube Double cone with inclined plane Double cylinder for the Archimedean principle Drum armature with bipolar winding

Duhamel's cylinder Dutch tears Dutrochet's endosmometer Dynamo-electric machine Dynamometer 1 Dynamometer 2