The Multi Spectral Scanner (MSS) instrument on board Landsat 1-5 was built by SBRC (Santa Barbara Research Center) of Hughes Aircraft Company in Goleta, CA and flown on Landsat 1-5. The objective of MSS was to provide repetitive daytime acquisition of high-resolution, multispectral data of the Earth's surface on a global basis and to demonstrate that remote sensing from space is a feasible and practical approach to efficient management of the earth's resources. MSS is an opto-mechanical scanning instrument (whiskbroom technique, unidirectional operation) consisting of a double reflector-type telescope, scanning mirror, filters, detectors, and associated electronics.The MSS instrument had a spatial resolution of approximately 79 metres with four bands ranging from the visible blue to the Near Infra-Red (NIR).
Further information on the Landsat spacecraft that hosted the MSS instrument, as well as information on the instrument itself is available here.
Landsat MSS Links