shaft 20 functions as a leg of the electrical circuit shaft 20 is hollow and contains a single insulated wire 26 terminating at one end at a contact not shown at the interior portion of switch 18 and terminating at the opposite end in blade 22 at an electrical contact of lamps 24 which can be connected either in parallel with suitable branching of wire 26 or in series with connections between individual lamps 24 many prior art patents describe methods for mounting small electrical lamps in surgical implements and certain of these disclosures are incorporated in this application by reference to the following patents u s pat no 1 767 025 issued june 24 1930 to wappler shows a cystoscope without mechanical movement or articulated parts disclosing a lamp 16 mounted in an extension 15 of the device another disclosure of mounting means is found in the wappler u s pat no 878 917 issued feb 11 1908 and in the endoscope disclosed by takahashi in u s pat no 4 078 55 issued mar 14 1978 instead of utilizing the framework of the device of fig1 as a leg of the electrical circuit two insulated wires can be used each carrying current to lamps 24 from batteries 12 such a configuration would be required for example if shaft 20 is constructed of a non conductive material such as could be preferable in certain surgical procedures where some danger from the presence of an electrical conductor might exist during the surgical operation in.