Lunokhod-1 consists of two main parts - an instrument bay and a wheeled chassis. Its total weight is 756 kilogrammes. The hermetically sealed instrument bay is truncated cone made of magnesium alloys to ensure sufficient strength and lightness of weight. Its upper part is used as a cooling radiatir in the thermo regulating system. It is covered by a double function lid. When lunar night sets in, the lid covers the radiator to keep the heat inside the bay, and during the lunar day the lid opens and the solar battery cells on its inner side rechange the storage batteries feeding power to the on-board equipment. The front of the instruments bay has portholes for television cameras, an electric drive for a moving pencil-beam antenna serving to transmit television pictures of the moonscape back to Earth, low directivity antenna to receive radio commands and send back telemetric information, and also scientific instruments and an optical corner reflector. There are four telephoto cameras along the port and starboard, two on each side. In each pair one camera is linked with a local vertical finder. On each side there are also four rod antennas to receive radio commands from the earth on another frequency band. There is also an isotope heat source to heat the gas circulating inside the vehicle. Next to the heat source is an instrument to determine the physical and mechanical properties of lunar soil and a mechanism to lift and lower the ninth wheel.