![]() ![]() While there were significant improvements in stretcher design, such as the introduction of beveled edges, the overall level of individual craftsmanship deteriorated. Many new stretcher designs were patented and are therefore datable. The 19th century ushered in the age of commercially produced stretchers. This led to the development of the two-key design with grooves to better secure the keys. Some of the early keyed designs were problematic: single-key constructions produced uneven tensions, and keys were easily lost from open notches. ![]() ![]() Th century with the introduction of the key. Stretchers with expandable joints appeared by the mid-18 Early stretcher designs had fixed joints, often a mortise and tenon or lapped construction secured with wooden pegs or nails. Since their introduction, the design and construction of stretchers 1 have continued to evolve. The remarkable success of canvas painting supports from the 16th century onward likely owes much to the development of lightweight stretchers. Stretcher as Artifact Aesthetic and Historical Considerations
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