The 19th century practice of lining a painting, sometimes referred to as relining, which strengthens a painting by attaching a new canvas to the back of the existing one, can be read about in watercolour artist Theodore Henry Fielding's writings.
The procedure as carried out in the 19th century is described by Theodore Henry Fielding in his Knowledge and Restoration of Old Paintings (1847). The process is sometimes referred to as relining. The lining of paintings is a process of restoration used to strengthen, flatten or consolidate oil or tempera paintings on canvas by attaching a new canvas to the back of the existing one. 
