Sealed housing for electrical apparatus

Claim 1

A SEALED EXTERNALLY ACTUATABLE ELECTRICAL UNIT COMPRISING A HOUSING HAVING EDGE AND SIDE WALLS DEFINING AN INTERNAL CHAMBER TO RECEIVE VARIABLE ELECTRICAL CONTROL MEANS, SAID SIDE WALLS BEING SUBSTANTIALLY PARALLEL ON AT LEAST THEIR EXTERNAL SURFACES, A ROTARY ACTUATING MEMBER HAVING A CYLINDRICALLY CURVED PORTION CARRYING INDICIA ON THE EXTERNAL SURFACE THEREOF AND OVERLYING THE EDGE OF SAID CHAMBER AND ADAPTED TO BE VIEWED EDGWISE OF SAID UNIT, SAID HOUSING INCLUDING A PORTION EXTENDING AT LEAST IN PART BEYOND THE RADIAL EXTREMITY OF SAID CYLINDRICALLY CURVED PORTION OF THE ACTUATING MEMBER AND OVERLYING AT LEAST A PORTION OF THE EXTERIOR SURFACE THEREOF TO DEFINE A CHANNEL RECEIVING SAID CURVED PORTION, AND A ROTARY SHAFT AT THE CENTER OF THE CYLINDRICALLY CURVED PORTION JOURNALLED IN THE HOUSING AND COUPLED TO THE ACTUTING MEMBER TO DRIVE THE ELECTRICAL CONTROL MEANS AND COUPLED TO THE CYLINDRICALLY CURVED PORTION WHEREBY THE LATTER TURNS IN ROTARY MOTION THEREWITH.