1. IN A MONO-CABLE TRAMWAY PASSENGER CHAIR INCLUDING A HANGER PIVOTALLY SUPPORTED FOR SWINGING MOVEMENTS ABOUT THE SUBSTANTIALLY HORIZONTAL AXIS OF A SINGLE CABLESUPPORTED NON-ROTATABLE SPINDLE, A CHAIR SWINGING MOVEMENT DAMPER, COMPRISING: MEANS FOR CONVERTING MECHANICAL ENERGY TO HEAT; AND MEANS CONNECTING SAID FIRST NAMED MEANS TO SAID SPINDLE AND SAID CHAIR, FOR EFFECTING THE CONVERSION OF SWINGING-MOVEMENT-INDUCED MECHANICAL ENERGY TO HEAT.