Abstract
The Shirley Automatic Size Box enables the percentage of size put on any warp to be con trolled at any value, irrespective of variations which occur in the take-up characteristics of the warp, the physical properties of the size, or the mechanical conditions imposed by the machine. This paper, as well as describing clearly the principle of the box, develops a simple mathematical analysis of the regulating system and shows how various factors affect its response rate. Good agreement is shown to exist between theoretical and observed response curves. The essential features of the components of the production model of the box are described in some detail, and some of the advantages to be expected from using the box correctly under industrial conditions are discussed briefly.
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