The Present Status of the Glass Bottle and Hollow Ware Industries in the United States
Journal of Industrial & Engineering Chemistry
5 1 it is reached. Heat will not warp bakelite micarta, and i t will stand an electric arc better than hard fiber, hard rubber, built-up mica, or any moulded insulation containing fibrous or resinous materials. Its coefficient of expansion is low, being approximately o.oooo? per degree Centigrade. Bakelite micarta is insoluble in practically all of the ordinary solvents, such as alcohol, benzine, turpentine, and weak solutions of acids and alkalis, hot water and oils. It is indifferent to ozone
... ndifferent to ozone -an advantage over hard rubber, resins, etc., for electrical purposes. It is non-hydroscopic and impervious to moisture. The other grade designated as No. 53 micarta has the same mechanical and electrical properties' as the bakelite micarta, but differs in its chemical and thermal properties. The plain micarta behaves toward chemicals and heat very much as an ordinary resin. This grade is not used in plate form. NEW CENTRIFUGAL PUMP The Engineering Record, Oct. 4, 1913. reports that a new centrifugal pump ranging in size from 2 to 15 inches and suitable for low speeds is being placed on the market by a Philadelphia company. The casing is made solid with a detachable suction head and carries on the top a detachable flange which supports the stuffing box and thrust bearing. By removing the bolts in the upper flange the casing may be opened for inspection of the impeller without disturbing the suction or discharge flanges. The casing is of cast iron and is fitted with removable bronze bushings. The thrust bearing, which is of the radial ball type, is carried on the pump housing and is fitted with a sight feed lubricator. The guide bearings are lubricated automatically. The impeller is of the closed type. The frame is of channel iron with suitable braces which carry the guide bearings, and the motor is supported on a cast-iron base.