Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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rolling ( rolling machine )

The process of smoothing and compressing the grain surface of leather by subjecting it to the action of a metal roller under pressure. UnlikeGLAZING , rolling involves the use of a revolving steel roll and is usually done in a rolling machine, or rolling jack, which is very much like the glazing machine, except that the latter has a stationary roll made of solid glass in place of the revolving steel roll. While the steel roll strikes the leather with considerable pressure, there is no great friction, as in glazing, and no measurable heat is generated. While being rolled, the leather is usually rotated so that the entire area is rolled twice, a process referred to as "rolling twice around." (363 )

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