Lunar Roving Vehicles were used on Apollo missions _15_, _16_, and _17_ and were driven a total of 90 kilometers (56 miles) on the Moon. The crew of _Apollo 15_, the first to use an LRV, drove their vehicle 27.9 kilometers (17.3 miles) at speeds up to 19-21 kilometers (12-13 miles) per hour. In comparison the _Apollo 14_ astronauts traveled only 4.2 kilometers (2.6 miles) on foot. LRVs enabled the astronauts to carry heavy, bulky equipment and to place scientific instruments at considerable distances from the lunar module. An LRV could carry two astronauts as far as 91.5 kilometers (57 miles) across the lunar surface or operate for up to 78 hours. Each LRV was transported to the Moon in a compartment of the descent stage of a lunar module. Four LRVs were built by the Boeing Company. Three were used on the Moon; the LRV on display was used in tests. The LRV on exhibit is from the National Aeronautics and Space Administration. Weight On Earth 210 kg. (462 lb.) On Moon 34 kg. (76 lb.) Payload On Earth 490 kg. (1080 lb.) On Moon 80 kg. (178 lb.) Length 3.1 m. (10 ft., 2 in.) Width 1.8 m. (6 ft.) Wheel base 2.3 m. (7 ft., 6 in.) Turning radius 3 m. (10 ft.) Drive One ¼ h.p. motor in each wheel; total 1 h.p. Power source Two 36-v. silver-zinc batteries Apollo Lunar Tools and Equipment [Illustration: 88. The Apollo Lunar Hand Tool Carrier holds 32 kilograms (70 pounds) of equipment, including a trenching tool, two geology scoops, four rock bags, a portable magnetometer, and five cameras.] Penetrometer Tongs Extension handle Core tube caps assy. Color chart & traverse map Core tubes 16mm camera Camera staff 35-bag dispenser Core tubes Scoop Hammer Lens/brush Gnomon Most tools and other pieces of equipment used by Apollo astronauts on the Moon were left behind as the astronauts departed to return to the Earth. This was done to conserve weight in the lunar module ascent stage so that the maximum quantity of samples of lunar soil and rocks could be brought back to the Earth. Some tools and pieces of equipment, however, were returned to the Earth. These include such items as a lunar hammer, a 16-mm camera, film cassettes, lunar sample return containers, parts of a lunar roving vehicle fender, and parts of the unmanned spacecraft _Surveyor 3_ visited by _Apollo 12_ astronauts. In addition, astronauts carried small mementos with them when they landed on the Moon. Other lunar tools and instruments on exhibit were backup, prototype, or used by the astronauts in pre-flight training. The lunar hammer is on loan from Alan L. Bean; other tools and instruments are from the National Aeronautics and Space Administration.