Abstract: An electric cooking oven comprising a cooking vessel (1), a microwave energy source and a waveguide (2') substantially parallelepiped in shape delimited transversally by two substantially rectangular surfaces (20', 21') located in two parallel planes separated by a predefined distance (d), the output of guided waves occurring in at least two zones (230, 231) located in an outlet plane (23') perpendicular to the two surfaces and delimited by two parallel edges (b'.sub.1, b'.sub.4) connecting the two surfaces. The length (1) of the edges is greater than the distance (d) separating the two surfaces (20', 21') so as to optimize the number of excited transversal electric and/or transversal magnetic modes inside the cooking vessel in excitation planes parallel to the outlet plane.

Abstract: Device for conducting chemical operations, comprising a working chamber (1) delimited by a top (2), a bottom (3), side walls (4, 5) and a door, a microwave energy generator (6) for the chamber, and a reactor (7) having at least one neck (8) and resting in the chamber on a support (9). The chamber (1) is pierced by at least one passage (12) which permits connecting the neck (8) of the reactor (7) with a connection conduit (13) secured to an external device for conducting a chemical reaction. The chamber is also pierced by two other passages (15 and 16) adapted respectively to permit the connection of two other necks (17 and 18) to the reactor (7).