Abstract: There is provided an electron beam sterilizer judging, in an electron beam irradiation zone, whether an electron beam amount to be irradiated to a resin bottle is proper or improper. The sterilizer includes an electron beam irradiator for irradiating the resin bottle with an electron beam through an irradiation window and a bottle conveyer for conveying the resin bottle, and the resin bottle conveyed in front of the irradiation window is irradiated with the electron beam to thereby sterilize the bottle. A beam collector is disposed in front of the irradiation window so as to oppose thereto. The beam collector is supported in an electrically insulated manner by an insulating member. When the electron beam irradiates the beam collector, an electric current flowing the beam collector is measured by an electric current measuring device.

Abstract: Apparatus for indicating incomplete and complete fastening of a screw includes a washer and a ring of a generally flat synthetic resin sheet. The washer includes a pair of washer portions of a generally flat, round shape and a joint portion interconnecting the washer portions to face them in opposite directions to enable the washer portions to receive a shank of a screw in the openings thereof. The lengthwise section of the joint portion forms generally a U shape. The ring is made of a generally round, deformable material and is inserted between the pair of washer portions thus facing each other. The deformable material is expanded radially outward, when compressed by the washer portions receiving the shank of the screw when fastened. Upon the compressive force reaching a predetermined value, the ring will be broken due to the pair of washer portions overlaying one another.