. Revisión del ferrocarril eléctrico . id cualquier error debido a la necesidad de paralelismo de sus sidesy para permitir que sea rectificado con la pérdida mínima. Todas las caras planas deben ser molidas sin alterar su posiciónen el soporte, para asegurar la exactitud de los ángulos y uniformidad en los resultados. Este requisito es particularmente importante en las herramientas de hilo. El portaherramientas debe ser capaz de presentar la herramienta a la rueda de tal manera que cualquier cara puede ser tan fundamental para tener una relación definida y predeterminada con las otras caras y con el vástago, y los ajustes necesarios para lograr así deben ser fácilmente unde

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. Electric railway review . id any errors due to want of parallelism of its sidesand to enable it to be reground with the minimum loss. All ofits plane faces should be ground without altering its positionin the holder, to insure accuracy of the angles and uniformityin results. This requirement is particularly important inthread tools. The tool holder should be capable of presenting the toolto the wheel in such manner that any face can be so groundas to have a definite, predetermined relation to the otherfaces and to the shank, and the adjustments necessary toaccomplish thus must be easily understood and quickly ma-nipulated. It must be so mounted as to enable the tool faceto be easily and quickly reciprocated past the line of cut ofthe wheel, and to be reliably fed against it and brought toany part of it. The cuts should be light, quick and frequentto produce the best results in the shortest time. Experiments have demonstrated that for roughing cuts acurved cutting edge is more efficient than a straight one, and. Universal Tool Grinder Belt Driven by an Allis-ChalmersMotor. that different materials and different depths of cut requiredifferent degrees of curvature; also that the cut should be adraw cut and not a gouging cut, so that the bulk of the metalwould be removed ahead of the point of the tool. This addsgreatly to its life, the point being the most delicate part. Universal tool grinding machines, manufactured by Will-iam Sellers & Co. of Philadelphia, Pa., such as the one illus-trated herewith, which is belted to an Allis-Chalmers type Kmotor, have been designed to meet the above requirements.Heat generated by the grinding is carried off by means of alarge volume of water at low velocity, which is forced to thetool by a rotary pump through a system of jointed pipes, end-ing in an adjustable nozzle. The use of such a large quantityof water demands that all working parts should be protectedfrom it on account of the grit carried along with it. This hasbeen effect

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