Potentiometer

Claim 1

A POTENTIOMETER COMPRISING: A CASING HAVING AN UPPER RECESS, A LOWER RECESS, A BORE COMMUNICATING BETWEEN SAID RECESS, A TOP WALL CLOSING SAID UPPER RECESS IN SEALED RELATIONSHIP WITH SAID CASING AND A BOTTOM WALL CLOSING SAID LOWER RECESS IN SEALED RELATIONSHIP; A WOUND WIRE RESISTANCE ELEMENT MOUNTED IN SAID UPPER RECESS; AN ANNULAR CONDUCTIVE TERMINAL IN SAID UPPER RECESS AND IN INSULATED RELATIONSHIP RELATIVE TO SAID RESISTANCE ELEMENT; RESILIENT CONDUCTIVE WIPER MEANS ROTATABLY SUPPORTED IN SAID UPPER RECESS AND HAVING A PAIR OF SLIDING RESILIENT CONTACTS, ONE OF SAID SLIDING CONTACTS BEING ENGAGED WITH SAID TERMINAL AND ANOTHER OF SAID CONTACTS BEING IN ENGAGEMENT WITH SAID RESISTANCE ELEMENT; SAID RESISTANCE ELEMENT, SAID WIPER MEANS AND SAID CONDUCTIVE TERMINAL BEING ADAPTED TO BE ELECTRICALLY CONNECTED THROUGH SAID CASING TO AN ELECTRICAL CIRCUIT; A SHAFT ROTATABLY MOUNTED IN SAID BORE AND CONNECTED TO SAID WIPER MEANS; MANUALLY OPERABLE MEANS MOUNTED IN SAID LOWER RECESS IN DRIVING ENGAGEMENT WITH SAID SHAFT AND EXTENDING OUTWARDLY THROUGH A SIDE WALL OF SAID CASING FOR ROTATING SAID WIPER MEANS TO VARY THE POSITION OF THE OTHER OF SAID SLIDING CONTACTS RELATIVE TO SAID RESISTANCE ELEMENT; AND AN ANNULAR SEALING MEANS MOUNTED IN SAID BORE INTERMEDIATE SAID RECESSES FOR SEALING SAID SHAFT AND SAID BORE SO AS TO SEAL SAID UPPER RECESS FROM SAID LOWER RECESS.