Proceedings of the American Institute of Electrical Engineers

The nitrogen contained in the atmosphere is in an inert form and does not readily lend itself to chemical reactions. To overcome this is the province of “nitrogen fixation.” There are very definite commercial limitations involved in accomplishing this as the world's supply of nitrogen has been readily obtained from vast natural deposits of sodium nitrate in Peru and Chile and the pro... View full abstract»

This paper deals very briefly with troubles which affect the operation of carbon brushes on motors and generators. It should be of great assistance to the operator in locating various machine troubles and in securing the best service from his brushes. The paper is divided into five sections, based on the location of the cause of trouble: (1) field, (2). armature, (3) commutator, including brush ri... View full abstract»

In this article the author outlines the broad and increasing use of fractional horse power motors and the chief causes for the advance in popularity of motor-driven machines. The success in this field of motor application has been largely due to the perfection of a reliable and simple single-phase motor. The development in the design and construction of the single-phase motor is traced from its or... View full abstract»

The paper gives a general description of the typical method of handling ore from the mine to the blast furnace, describing in a general way the machinery used in the different steps of the process. The general principles underlying the application of electric motors to these various types of machines are discussed, as well as the class of motors best adapted to the work and the considerations in r... View full abstract»

THE work of applying electricity to industrial operations consists in properly combining the motor, controller and machine to be driven. This involves the characteristics of all three and a number of other features which are concerned more or less in the particular situation. The following is a list of some of the factors involved and is intended to be used as an introduction to a discussion on th... View full abstract»

The author examines the cause of line disturbances in starting hoists and elevator motors and draws comparison between the performance of wound-rotor motors and squirrel cage motors of a special design for elevator service. Diagrams are given showing graphically the current required for each type of motor to produce a given torque, and the method of control required by different types of motors is... View full abstract»

The paper contains a general description of the process of electric arc welding and discusses some of the general principles involved in this work. Some of the principal difficulties encountered in electric arc welding are described and comparison is made of its advantages over other methods of welding. The author concludes that there are very few cases of welding which cannot be more satisfactori... View full abstract»

Mr. Scott: Mr. Whitney's paper is of particular importance to central station men because it shows that there is a field for prospective business open that is usually placed in the same class with steam laundries, that is to say, absolutely unapproachable. I have never dealt directly with any logging men, but have had occasion to attempt to sell power to a few sawmill men, particularly for small p... View full abstract»

Harris J. Ryan (by letter): Replying to Mr. Fortescue's questions: The high-frequency driving voltage of the arc was multiplied about one hundred times by resonance. The impressed voltage of the arc having an irregular wave form was consumed in the first few turns of the outer helices. Thus in a given case the potential to neutral of the sixth turn from either arc terminal would, on test, be found... View full abstract»