A tightening key is a small wedge or shim used in the construction of a canvas stretcher frame with expandable joints. The key is inserted into the slotted inside the stretcher bars at the mitered corners of the frame to prevent or adjust sagging.[1][2][3] Tightening keys are commonly made in plastic or wood, and are often called corner keys or corner wedges.[3] Tightening keys were introduced in the mid-18th century, making expandable (versus rigid) stretcher frames possible.[4]
- ^ Basic condition reporting : a handbook. Deborah Rose Van Horn, Heather Culligan, Corinne Midgett, Southeastern Registrars Association (4th ed.). Lanham, Maryland. 2015. p. 77. ISBN 978-1-4422-4770-3. OCLC 894625590.
{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: others (link) - ^ The preservation management handbook : a 21st-century guide for libraries, archives, and museums. D. R. Harvey, Martha R. Mahard, Donia Conn (2nd ed.). Lanham, Maryland. 2020. p. 317. ISBN 978-1-5381-0900-7. OCLC 1121443778.
{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: others (link) - ^ a b Friel, Michael (2010). Still-life painting atelier : an introduction to oil painting (1st ed.). New York. p. 48. ISBN 978-0-307-82878-1. OCLC 897376626.
{{cite book}}: CS1 maint: location missing publisher (link) - ^ Tsang, Jia-Sun; Madruga Carvalho Caldeira, Ines; Williams, Don; Pelasara, Rick; Patterson, Robert (2013). "Modernized Stretcher for Paintings on Canvas: Assessment and Observation" (PDF). Postprints. 26. American Institute for Conservation of Historic and Artistic Works: 91–92.