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abwatts air films airplane alternating current amperes apparatus applied arc welding artificial line cable capacitance cent Chairman codes coil Committee connected constant copper curve cycles diaphragm dielectric dielectric strength direct direct current effect electrification electrode engineers equation equipment field flux formula gas space gas welding given gradient ground harmonics high frequencies hysteretic impedance increase insulation ionization lighting limit machine magnetic magnetic circuit material maximum measured mechanical metal meter method motor mutual inductance neutral obtained ohms operation oscillation paper permittivity phantom plate possible practically present problem produced protection radiation radio reactance relays resistance return conductor Sample short circuit shown in Fig solution spot welding standard station steel stress Table telephone temperature tests thickness tion transformer transmission line transposition tube vacuum tube vector voltage volts wave front wave length welder winding wire
Page 151 - Early in his investigations, the writer concluded that a substantial equilibrium must be maintained between the fusing energy of the arc and the feeding rate of the welding strip ; and it soon became evident that if the welding strip is mechanically fed forward at a uniform rate equal to the average rate of consumption with the selected arc energy, this equilibrium is actually maintained by the arc itself, which seems to have, within certain circumscribed limits, a compensatory action as follows:...
Page 102 - Elongation in 8 inches, minimum per cent., -, .; — 7 rr' tensile strength 6. Yield point by drop of beam method. 7. Cold bend test; no cracking on outside of bent portion when bent 180 degrees around a pin the diameter of which is equal to the thickness of the plate. 5. Cutting of Plates. — (a) The method of cutting a plate 5 feet by 20 feet into pieces for welding is shown in the accompanying reproduction of drawing No. 102 of the Bureau of Standards. (b) Each plate shall be given a distinguishing...
Page 151 - ... due to its becoming too long. The problem that arose was to devise means whereby the natural self-compensatory action of the arc could be so greatly accentuated as to preclude, within wide limits, the occurrence of marked arc abnormalities. There was ultimately evolved, by experiment, such a relation between- the fusing energy of the arc and the feeding rate of the welding strip as to give the desired arc length under normal conditions; and tendencies toward abnormalities in arc conditions, no...
Page 726 - Of even greater importance, poor lighting impairs vision. Because diminution of eyesight from this cause is gradual, it may take the individual years to become aware of it "This makes it all the more important to guard against the insidious effects of dim illumination, of glaring light sources shining in the eyes, of flickering light, of sharp shadows, of glare reflected from polished parts of work. To conserve the eyesight of the working class is a distinct economic gain to the state, but regardless...
Page 187 - Engineers, The American Society of Mechanical Engineers, American Institute of Electrical Engineers, and The Society of Naval Architects and Marine Engineers.
Page 156 - ... per min. The productive capacity of the machines so far made has been from three to ten times that of manual welding methods, depending on the thickness of the work material; the difference in favor of automatic welding varies inversely as such thickness. The writer is now designing an improved type of machine for use especially on heavy work, with which machine it is expected to be able automatically to lapweld l/% in.
Page 796 - A qualifying term applied to any relay indicating that there is purposely introduced a delay in action, which delay remains substantially constant regardless of the magnitude of the quantity that causes the relay to function.
Page 21 - ... radius would be to the size of the earth. From the standpoint then of the electromagnetic theory of the origin of mass, the dimensions of the negative and positive constituents of atoms in comparison with the dimensions of the atoms themselves are like the dimensions of the planets and asteroids in comparison with the size of the solar system. All these computations, whatever their value, are rendered possible by the fact that e is now known. Now we know from methods which have nothing to do...
Page 726 - Because diminution of eyesight from this cause is gradual, it may take the individual years to become aware of it. This makes it all the more important to guard against the insidious effects of dim illumination; of glaring light sources shining in the eyes; of flickering light; of sharp shadows; of glare reflected from polished parts of the work. To conserve the eyesight of the working class is a distinct economic gain to the state, but regardless of that, humanitarian considerations demand it.
Page 738 - Emergency lighting systems shall be supplied from a source independent of the regular lighting system wherever possible. This source of supply and controlling equipment shall be such as to insure the reliable operation of the emergency lighting system when through accident or other cause the regular lighting system is extinguished. Where a separate source of supply cannot be obtained for the emergency lighting the feed for emergency lights must be taken from a point on the street side of all service...