tension upon the rotating mandrel between centers and the position and sharpness of the knives. The speed of the mandrel is around 2,200 RPM. 10. The finished cylinders are placed in boxes which contain 16 pegs and run down a conveyor. At a point on this conveyor, the cylinders are held and brushed on the inside to remove wax shavings and dust. 11. Cylinders are inspected, packed and placed in the stock room for a minimum of thirty days before shipping. 12. The reinforcing liners are made as follows: Crinoline cloth of specifications given under "Tests", are cut into a trapezoid (Paper Products Dept.) base length 6¼, altitude 5⅝" top length 5¾". A pack of these are placed in a vise edgewise and thinned glue, one part Le Pages Glue, one part water, brushed onto one slant edge. A liner is then wrapped a tapered mandrel of such size as to fit no too snugly on the molding core. The liner is held on the mandrel by means of two jaws actuated by a foot lever and the lapped edges of the liner glued by means of a gas iron held for an instant along the line of the lap. J.W. Nell December 8, 1943 Edison disc records In October 1912 the Edison Diamond Disc Record was introduced. Edison Laboratories had been experimenting with disc records for some 3 years, as the general public seemed to prefer them to cylinders. The thick Edison Discs recorded the sound vertically in the groove at a rate of 150 grooves-per-inch (GPI) rather than the typical laterally-cut groove of around 100 GPI, which gave 10-inch Edison discs a longer playing time (up to five minutes) than laterals and could only be played to their full advantage on Edison Diamond Disc Phonographs. This combination produced audio fidelity superior to any other home record playing system of the time. However, Edison Discs and phonographs were more expensive than their competitors'. This, together with the incompatibility of the Edison system with other discs and machines, had an adverse effect on Edison's market share. Nonetheless, Edison Discs for a time became the third best selling brand in the United States, behind Victor and Columbia Records. With World War I various materials used in Edison Discs came in short supply, and many discs pressed during the war were made hastily and with inferior materials, notably a reformulated phenolic finishing