Device having a semi-cylindrical tube stem receiving recess for testing filament continuity in electron tubes

Claim 1

AN ELECTRICAL TESTING DEVICE FOR TESTING FILAMENT CONTINUITY IN ELECTRON TUBES COMPRISING AN INSULATIVE CASING INCLUDING FIRST AND SECOND WALLS MEETING SUBSTANTIALLY AT RIGHT ANGLES TO FORM A CORNER, SAID FIRST WALL HAVING A SUBSTANTIALLY SEMI-CIRCULAR INDENTATION EXTENDING INWARDLY FROM SAID CORNER FORMING A CURVED EDGE PORTION TO SAID FIRST WALL, SAID SECOND WALL HAVING IN A PORTION THEROF A SUBSTANTIALLY SEMI-CYLINDRICAL CURVED PORTION FORMING A DEPRESSION THEREIN, THE TRANSVERSE EXTENT OF THE SURFACE OF THE CURVED PORTION OF SAID SECOND WALL BEING COEXTENSIVE WITH THE CURVED EDGE PORTION OF SAID FIRST WALL, SAID CURVED EDGE PORTION OF SAID FIRST WALL AND SAID CURVED PORTION OF SAID SECOND WALL FORMING A SUBSTANTIALLY SEMICYLINDRICAL TUBE STEM RECEIVING RECESS, SAID FIRST WALL BEING PROVIDED WITH A PLURALITY OF TUBE PIN RECEIVING APERTURES SPACED AROUND SAID CURVED EDGE PORTION, A LAMP SOCKET IN SAID CASING, A FIRST CONDUCTIVE PLATE SECURED WITHIN SAID CASING HAVING PORTIONS INTERSECTING AXIAL PROJECTIONS OF PREDETERMINED ONES OF SAID APERTURES AND HAING AN ARM EXTENDING INTO SAID LAMP SOCKET FORMING A FIRST LAMP CONTACT, A SECOND CONDUCTIVE PLATE SECURED WITHIN SAID CASING HAVING PORTIONS INTERSECTING AXIAL PROJECTIONS OF PREDETERMINED OTHER ONES OF SAID APERTURES AND AHVING AN ARM EXTENDING THEREFROM FORMING A FIRST BATTERY CONTACT, A SECOND LAMP CONTACT IN SAID LAMP SOCKET, A SECOND BATTERY CONTACT SPACED FROM SAID FIRST BATTERY CONTACT, AND CIRCUIT MEANS CONDUTIVELY CONNECTING SAID SECOND BATTERY CONTACT AND SAID SECOND LAMP CONTACT.