Abstract: A clutch or brake protection device for use with a clutch having relatively axially movable components, the device including an element mounted on one of the components and situated adjacent to the other of the components, the position of the element being such that it will contact the said other component when wear in the clutch or brake in excess of a predetermined amount has taken place, to complete electrical connection and provide a signal indicating the condition of the clutch or brake.

Abstract: A multi-spindle lathe having a multi position multiple rotary electrical switch associated with a drum in which the spindles are rotatably mounted, the drum and switch being indexable between a number of finite positions equal to the number of spindles, each spindle having clutch and brake units, the switch being arranged to control circuits to said units and the switch having fixed and rotatable parts carrying respective co-operable electrical contacts forming part of the circuits and also having at least two continuous conductor rings on one of the parts and contacts carried on the other of the parts engaging the conductor rings respectively, selection of any one of the possible indexed positions of the switch providing simultaneous connection between a number of said co-operable contacts and said contacts engaging the conductor rings being in contact therewith at all possible positions of the switch and control being provided for controlling electrical supply to the contacts and to the rings for selective