Singapore Teleview was a Singaporean videotext service. This was the basis of the Teleview system which was used briefly in 1922. A later development from Teleview provided an interfaced connection to the Internet. Historic systems also used spinning discs, for example the Teleview system. In 1922, Hammond invented the Teleview system of shutter glasses in association with 3-D films. Teleview pioneered the alternate-frame sequencing method of stereoscopic 3D projection. Teleview was the first alternating-frame 3D system seen by the public.