32—CONSERVATION OF MEAN LEVEL IN AUTOLEVELLING

Conventional autolevelling is a radicai process in the sense that the mass per unit length of the product is determined by the setting of the autoleveller itself. This fact tends to limit the application of autolevelling to an early high-production process because, althougn there is a great deal of interest in the elimination of local variations introduced in subsequent processes, it is appreciated that the maintenance of a high standard of long-term uniformity is even more important than the removal of local irregularities. An attractive solution, which may well permit the employment of autolevellers at later processes than is at present economically and technically practicable, is conservative autolevelling. By this is meant autolevelling by devices which, although able to correct local variations, cannot exercise radical control of the mean level of the product. Part I of this paper considers the principles involved in the methods at present available for conservative autolevelling. Part II gives a the...