Abstract: A mechanical transmission is provided to transmit rotary mechanical motion at a mechanical advantage that is selectively and infinitely variable. An output shaft in an output drive mounting frame is driven by a rotary input drive in an input drive mounting plate. The mechanical advantage at which power is transmitted is governed by the position of the output drive mounting frame relative to the input drive mounting plate. A plurality of separate intermediate links, all having toothed gear sections are driven by the input drive and are sequentially and discontinuously brought into meshed engagement with a drive output gear. The intermediate links are all rotatable independently of each other about a common axis on the output drive mounting frame.