1. ELECTRIC SIGAL TRANSMISSION EQUIPMENT WHEREIN SIGNAL TRANSMISSION SPEEDS ARE CHANGED COMPRISING AN INCOMING SIGNAL CHANNEL, AN OUTGOING SIGNAL CHANNEL, AN ARRAY OF "FERRIC" CELLS, MEANS FOR SCANNING SAID CELLS SEQUENTIALLY AT A PREDETERMINED RATE, MEANS FOR RECEIVING A SUCCESSION OF SIGNAL ELEMENTS OVER SAID INCOMING CHANNEL AT A MUCH SLOWER RATE THAN THE RATE AT WHICH SAID CELLS ARE SCANNED BY SAID SCANNING MEANS, MEANS OPERATED BY SAID SCANNING MEANS FOR READING THE CONDITION OF SAID CELLS SEQUENTIALLY DURING EACH CYCLE OF SAID SCANNING MEANS, MEANS RESPONSIVE TO THE RECEIPT OF A SIGNAL ELEMENT FOR RECORDING DURING ONE SCANNING CYCLE THE CONDITION OF SAID ELEMENT IN THE CELL NEXT SUCCEEDING THE CELL IN WHICH THE LAST SIGNAL ELEMENT WAS RECORDED, MEANS CONTROLLED BY SAID SCANNING MEANS FOR NORMALLY CAUSING THE CONDITION OF EACH CELL READ DURING ONE CYCLE OF SAID SCANNING MEANS TO BE RERECORDED IN THE SAME CELL DURING THE SAME CYCLE, AND MEANS RESPONSIVE TO THE RECEIPT OF THE LAST ONE OF A NUMBER OF SIGNAL ELEMENTS CORRESPONDING TO THE NUMBER OF CELLS FOR APPLYING SIGNALS READ FROM SAID CELLS DURING ONE SCANNING CYCLE TO SAID OUTGOING SIGNAL CHANNEL.