E. S. LUNT, IMPORTER AND JOBBER OF Railway Car and Carriage Linings, Plushes, Cloths, Carpets, Satins, CURTAIN SILKS, COTELINES, &c. 99 CHAMBERS ST., CORNER OF CHURCH, ST., CORNER OF CHURCH, NIAGARA STEAM PUMP NEW YORK. WORKS This Pump has taken the first premium at every Fair in the United States where there has been a practical test. CHAS. B. HARDICK, 23 Adams Street, BROOKLYN, N. Y. SOLE MANUFACTURER OF HOLMES & LISSBERGER, IMPORTERS AND DEALERS IN COPPER. MANUFACTURERS OF Locomotive Fire Box Sheets and Flues, Braziers, 255 & 257 PEARL STREET, NEW YORK. AGENTS FOR THE NEW HAVEN COPPER CO. Barwick Wrench Co........... L. W. Pond....... Drills. Boston, Mass.... ....Worcester, Mass Rand & Waring Drill & Compressor Co...........New York... WIND MILLS. Deduction from Velocities varying from 4 to 9 Feet per Second. (Haswell.) 1. The velocity of wind-mill sails, so as to produce a maximum effect, is nearly as the velocity of the wind, their shape and position being the same. 2. The load at the maximum is nearly, but somewhat less than, as the square of the velocity of the wind, the shape and position of the sails being the same. 3. The effects of the same sails, at a maximum, are nearly, but somewhat less than, as the cubes of the velocity of the wind. 4. The load of the same sails, at the maximum is nearly as the squares, and their effect as the cubes of their number of turns in a given time. 5. When sails are loaded so as to produce a maximum effect at a given velocity, and the velocity of the wind increases, the load continuing the same-First,, the increase of effect, when the increase of the velocity of the wind is small, will be nearly as the squares of those velocities; Secondly, when the velocity of the wind is double, the effects will be nearly as 10 to 272; Thirdly, when the velocities compar、 d are more than double of that when the given load produces a maximum, the effects increase in nearly the same ratio of the velocity of the wind. 6. In sails where the figure and position are similar, and the velocity of the wind the same, the number of revolutions in a given time will be reciprocally as the radius or length of the sail. 7. The load, at a maximum, which sails of a similar figure and position will overcome at a given distance from the centre of motion is as the cube of the radius. 8. The effects of sails of similar figure and position are as the square of the radius. 9. The velocity of the extremities of Dutch sails, as well as of the enlarged sails, in all their usual positions when unl aded, or even loaded to a maximum, is considerably greater than that of the wind. Rule for the Angles of the Sails. (Molesworth.). A Angle of the sail with the plane of motion at any part of the sail. RTotal radius of sail in feet. D= Distance of any part of the sail from the axis. A 23° 18 D2 R2 If the radius of the wird mill sails be divided into six equal parts, the angles at each of those parts will be as follows, reckoning from the axis: Divided by the whip in the proportion of 5 to 3, the narrow portion being nearest to the wind. Width of sail at axis..... Distance of sail from axis.... Cross-bars from 16 to 18 inches apart. HP Horse-power. = 1-5th length of whip. Horse-Power and Sail-Area of Wind Mills. V = Velocity of wird in feet per second. Area of each sail A + N. A = HP 1080000 V3 HP = 1080000 Velocity of tips of sails 2.6 V, nearly. BUYERS' GUIDE, FOR RAILWAY OFFICERS. JOSEPH GILLOTT'S STEEL PENS. Sold by all Dealers. Each Pen is Stamped with the Maker's Name and its Particular Number. THE WELL KNOWN NUMBERS: 303, 404, 170, 351, Having been assumed by other makers, we CAUTION the Public AGAINST IMITATIONS. An injunction against infringements of our right to the above numbers and others as trade marks, was granted in 1867, and AFFIRMED by the Court of Appeals January, 1872. Manufacturers' Warehouse, 91 JOHN STREET, N. Y. JOSEPH GILLOTT & SONS, HENRY HOE, Sole Agent. |