Rotating data transmission device

A data transmission device comprising:

• a stationary part and a rotating part;
• a first plurality of data transmitters mounted on either one said stationary part or said rotating part;
• a second plurality of data receivers mounted on the other of said stationary part or said rotating part, wherein said second plurality exceeds said first plurality by one;
• a circular data transmission path in the part in which said data transmitters are mounted, said path being in data transmitting communication with said data transmitters and said data receivers;
• wavesinks means for dividing said data transmission path into a plurality of symmetrical sub-paths of equal length;
• and
• means for arranging respective data transmitters and data receivers at selected locations around said data transmission path so that more than one of said transmitters can simultaneously transmit respective data via respective data links in said data transmission path as said rotating part rotates with respect to said stationary part, each data link constitutes a portion of total data transmission path and is formed by a number of adjoining sub-paths, with the number of said adjoining sub-paths in each data link being fewer than total number of sub-paths which are present in said circular data transmission path.