Industrial World: Published ... in the Interest of Iron, Steel, Coke and Allied Industries, 76. ciltNational Iron and Steel Publishing Company, 1905 |
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Sayfa 127 - ... asphalt to 3 or 4 of sand or screenings by volume. This is to be thoroughly mixed in the kettle and then spread out on the surface with warm smoothing irons, such as are used in laying asphalt streets.
Sayfa 127 - Before applying asphalt to a metal surface, it is imperative that the metal be cleaned of all rust, loose scale and dirt ; and if previously coated with oil this must be burned off with benzine, or by other suitable means. The metal surface must be warm to enable the asphalt to adhere to it, and the warming is best accomplished by covering it with heated sand, which should be swept back as the hot asphalt is applied. (b) When waterproofing masonry structures, if the surface cannot be made dry and...
Sayfa 127 - pitching" point is reached the vapor from the kettle is of a bluish tinge, which changes to a- yellowish tinge after the danger point is past.
Sayfa 193 - The tool under treatment and the positive electrode are placed on a bed of non-conducting and non-combustible material and the arc started gradually at a low voltage and steadily increased as required, by controlling the shunt rheostat, care being taken not to obtain too great a heat and so fuse the end of the tool. The source of power in this case is a motor generator consisting of a continuous-current shunt-wound motor at 220 volts, coupled to a continuous-current shunt-wound dynamo at from 50...
Sayfa 127 - For structures under ground, such as masonry arches, abutments, retaining walls, foundation walls of buildings, subways, etc., a flow point of 185° F., and a brittle point of 0° F., will be required.
Sayfa 157 - ... is as follows : — Forge the tools as before, and when quite cold grind to shape on a dry stone or dry emery wheel, an operation which may be done with the tool fixed in a rest and fed against the stone or emery wheel by a screw, no harm resulting from any heat developed at this stage. The tool then requires heating to a white heat, but just short of melting, and afterwards completely cooling in the air blast. This method of first roughly grinding to shape also lends itself to cooling the tools...
Sayfa 192 - ... taps, screwing dies, reamers, and other tools that do not permit of being ground to shape after hardening, and where any melting or fusing of the cutting edges must be prevented, the method of hardening is as follows : — A specially arranged muffle furnace heated either by gas or oil is employed, and consists of two chambers lined with fireclay, the gas and air entering through a series of burners at the back of the furnace, and so under control that a temperature up to 2200° F.
Sayfa 195 - ... looked at; for it is not only rapidity of cutting that counts, but the output of machines is correspondingly increased, so that a greater production is obtained from a given installation than was possible when cutting at low speeds with the old tool steel, and the work is naturally produced at a correspondingly lower cost, and of course it follows from this that in laying down new plant and machines the introduction and use of high-speed steel would have considerable influence in reducing expenditure...
Sayfa 194 - ... it can be held at such temperature as long as is necessary, and the current can be gradually reduced until the articles operated on are cold again, and consequently the risk of cracking by too sudden expansion and contraction is reduced very greatly. The apparatus used is very simple, as will be seen by reference to the sketch. It consists of a continuouscurrent shunt-wound motor directly coupled to a single-phase alternating-current dynamo of the...
Sayfa 192 - F., on the attainment of which the cutter should be immediately withdrawn and plunged in cold oil. Of course there are various other ways of tempering, a good method being by means of a specially arranged gas-and-air stove into which the articles to be tempered are placed, and the stove then heated up to a temperature of from 500 degrees F.