Harvard Engineering Journal: A Quarterly Devoted to the Interests of Engineering in Harvard University, Volumes 5 à 61906 |
Autres éditions - Tout afficher
Harvard Engineering Journal: A Quarterly Devoted to the Interests ..., Volume 9 Affichage du livre entier - 1910 |
Harvard Engineering Journal: Devoted to the Interests of ..., Volumes 8 à 9 Affichage du livre entier - 1909 |
Harvard Engineering Journal: A Quarterly Devoted to the Interests ..., Volume 9 Affichage du livre entier - 1910 |
Expressions et termes fréquents
amperes angle apparatus armature axis belt conveyor Boston Bridge building Cambridge canal centre of gravity Charles River Chief Engineer circuit City Club columns Commission Company component concrete concussion constant construction cosh Cut Drop Cyclorama direction effect Electric energy Engineering Society entropy feet floor force formula friction graduates heat run hyperbolic angle increase Isthmus kilometre Leonato's machine mass mechanical Messina method miles motion motor Mystic River ohms operation pile pipe plate portion pounds pressure Prof radians radius radius of gyration rail-head Railroad reactance receiving-end impedance rheostat River rotation scene Schenectady Scientific School sending-end impedance shaft shown side speed square inch stage steam turbines steel Street Subway superheat superheated steam supply synchronous throttling tion torque track turbine valve vector velocity voltage volts wall wheel wire York York City
Fréquemment cités
Page 146 - Acts of the year 1898 authorized an issue of scrip to the amount of $500,000 for the construction of a dam across the Charles River, between the cities of Boston and Cambridge.
Page 170 - ... center of mass and radius of gyration of all the simpler bodies by integration. We are now in position to study the general problem of the motion of a rigid body in a plane. First, we define the angular acceleration...
Page 10 - War and to the Commission. Under the supervision and direction of the Secretary of War, and subject to the approval of the President, the Commission to be charged with adopting plans for the construction and maintenance of the canal ; with the purchase and delivery of supplies and plant ; with the employment of officers, employees and laborers, including the fixing of their compensation ; with the commercial operation of the Panama Railroad and its steamship lines ; with the utilization of the railroad...
Page 11 - ... letting of contracts to station men, competitive bids shall be secured by invitation on the ground where the work is to be carried on, but in such manner that the work of construction as a whole may be expedited. The head of each department shall make a report of the work and operation of his department to the chairman of the commission as often as may be required. The Secretary of the Interior shall make to the President a report, at least annually, and as often as he may deem advisable or the...
Page 173 - If a system of particles is free to move under the action of any external forces, the motion of a certain point called the centre of gravity is the same as if all the mass were concentrated at that point and all the forces acted at that point parallel to their original directions.* The centre of gravity is determined as. follows: Let x be the distance from a fixed plane to any point of the system, and let x be the distance from the plane to the centre of gravity; then Jxdw — x J dw, where dw is...
Page 12 - Of the Isthmian Canal Commission, on the 1st day of September, 1905, for the purpose of considering the various plans proposed to and by the Isthmian Canal Commission for the construction of a canal across the Isthmus of Panama...
Page 174 - The square of the radius of gyration of a body about any axis, is greater than the square of the radius of gyration about a parallel axis through the centre of gravity, by the square of the distance between those lines.
Page 155 - The turbine also operates at its best economy at or near full rated load, although possessing at the same time large overload capacity with remarkably high efficiency. The governor is of the fly-ball type, the ball levers being mounted on knife edges instead of pins to secure sensitiveness. The speed of the turbine while running may...
Page 11 - Commission, for its consideration and advice, the important engineering questions arising in the selection of the best plan for the construction of the canal. Its recommendation after consideration by the Commission, and with its recommendation, to be finally submitted through the Secretary of War to the President for his decision. The membership of the Commission appointed by this order to be: Theodore P. Shonts, chairman. Charles E. Magoon, governor of the Canal Zone. John F. Wallace, chief engineer....
Page 174 - Zmr2 is called the moment of inertia of the body about the given line. In other words, the moment of inertia is thus obtained ; take each element of the body, multiply it by the square of its perpendicular distance from the given line ; and add together all the quantities thus obtained. If this sum be equal to...