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The pull chain on the porcelain light fixture can be converted to a wall switch very easily. You will need to install a new two wire #14 cable from the box the fixture is mounted to now to the new wall switch box. Remove the power to the circuit by shutting that circuit's breaker off. The wire that is connected to the switch in the light fixture is the incoming "hot" wire. Disconnect it and re connect it to the black wire that goes down to the switch. Disconnect the white wire from the old porcelain fixture. For the installation of the porcelain fixture connect the white wire to the silver screw on the new fixture. Now connect the white wire that returns from the switch to the brass coloured screw on the new fixture. Mark this white wire with a small piece of black electrical tape to re identify it as not a neutral (code rule) but a potential "hot" wire. At the switch end make sure that the black wire is connected to the top screw and the re identified white wire (with a black tape marker) is connected to the bottom screw of the switch. Connect the ground wire in the cable to the new switch box and the existing fixture box. Install the switch making sure that the switch is in the off position and that the handle in facing downwards. Install switch plate cover, turn the breaker back on and you are finished.

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