Dynamometer, Built by B.B. Korn, 1938

Tether cars, gas-powered model race cars, were popular in the 1930s and 1940s. Few tether car makers matched the skill of Barney Korn. His remarkably detailed and largely hand-built models stood apart from mass produced units by larger manufacturers. Korn's models weren't big sellers – they were too slow for serious racers and too expensive for amateurs – but modern collectors value them for their beauty and rarity.

Tether cars provided big racing thrills in a smaller size. These miniature gas-powered model cars were raced individually while tethered to a central pivot, or against each other on a scaled-down track. At their peak popularity in the years surrounding World War II, some 25 major manufacturers -- and hundreds of individual builders -- produced tether cars. The artifacts in this set offer a peek into this exciting hobby.