A Nikon F + F36 Motor Drive + Cordless Battery Back provides a (U.S.) standard household socket that is a simple switch for triggering the camera. People used to construct homebrewed radio control devices to plug into it, but nowadays it seems like a PocketWizard with the MH1 cord would be simplest.
(Though is a Nikon F still a "classic manual camera" when we attach a motor drive?)
PocketWizard also makes a cord (HBM3) for triggering a Hasselblad 500EL, 500ELM, or 500ELX.