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ampere angle armature belt blade boiler bolt boring cast iron Catalogue cent chuck coal Company core crank cutter cylinder diametral pitch draft drawing drill drill press driving dynamometer feed feet finished friction gauge gear cutting give grinding head heat hole horse-power illustrated inches lathe length lever machine tools MACHINERY machinist manufacture mechanical metal method milling cutter milling machine motion mould number of teeth operation patent pattern piece pipe piston pitch diameter plane plate pounds practice pressure pulley reamer revolutions revolutions per minute screw screw machine shaft shape shown in Fig shows side sketch slide slot speed spindle spiral spring spur gear square inch standard steam engine steel surface taper thickness thread tion tooth tube turned valve velocity weight wheel wire worm worm gear
Δημοφιλή αποσπάσματα
Σελίδα 50 - Yard, when compared with a Pendulum vibrating Seconds of Mean Time in the Latitude of London, in a Vacuum at the Level of the Sea, is in the proportion of Thirty-six Inches to Thirty-nine Inches and one thousand three hundred and ninety-three thousandth parts of an Inch...
Σελίδα 51 - ARTICLE 3. The operation of the international bureau shall be under the exclusive direction and supervision of an international committee of weights and measures, which latter shall be under the control of a general conference for weights and measures, to be composed of the delegates of all the contracting governments.
Σελίδα 262 - To accomplish this, the bearing of the arbor which carries the blank is secured in an inclined position between two uprights to a semicircular horizontal plate, which can be oscillated on a vertical axis passing through the apex of the blank. To complete the rolling action, the arbor must, in the second place, receive simultaneously the proper rotation, and this effect is produced in the machine by having a portion of a cone (corresponding with the...
Σελίδα 51 - A uniformity in the weights and measures of the country is among the important objects submitted to you by the constitution, and, if it can be derived from a standard at once invariable and universal, must be no less honorable to the public councils, than conducive to the public convenience.
Σελίδα 50 - Parts of an Inch : Be it therefore enacted and declared, That if at any Time hereafter the said Imperial Standard Yard shall be lost or shall be in any Manner destroyed, defaced, or otherwise injured, it shall and may be restored by making a new Standard Yard, bearing the same Proportion to such Pendulum as aforesaid as the said Imperial Standard Yard bears to such Pendulum.
Σελίδα 317 - The best remedies for corrosion are generally the simplest and least expensive; but, after all, there can be no hard and fast rule laid down as to...
Σελίδα 50 - Yard hereby declared to be the Imperial Standard Yard, when compared with a Pendulum vibrating Seconds of Mean Time in the Latitude of London in a Vacuum at the Level of the Sea is in the...
Σελίδα 151 - ... a = area of piston in square inches, n = number of strokes per minute, or twice the number of revolutions per minute.
Σελίδα 301 - If computations are made, as is sometimes done, on an assumption that the pipes are hot twentyfour hours a day three hundred and sixty-five days in a year, the saving is nearly three times that shown in Table III. Generally speaking, a cover saves heat enough to pay for itself in a little less than a year at 310 ten-hour days, and iu about four months at 365 twenty-four-hour days.
Σελίδα 147 - Double-cut" gives a broken tooth, the surface of the file being made up of a large number of small, oval-pointed teeth inclined toward the point, and resembling in shape the cutting end of a diamond pointed cold chisel. In the rasp the teeth are entirely disconnected from each other. They are round on top, and are formed by raising, with a punch, small portions of stock from the surface of the blank. The...