To "heave the log," a man holds the log-reel over his head (at high speeds the man and portable reel are superseded by a fixed reel and a winch fitted with a brake), and the officer places the peg in the log-ship, which he then throws clear and to windward of the ship, allowing the line to run freely out.
The soundings are made by means of a special machine fitted with a brake so adjusted that the revolution of the drum is stopped automatically the instant the lead touches the bottom, and the depth can then be read directly from an indicator.
In America, also, freight trains are fitted with an automatic continuous brake, whereas in the United Kingdom this appliance is required by law only in the case of passenger trains, and in fact is not fitted to goods and mineral trains except in a few isolated instances.
In this way the brake may be arranged to maintain a constant torque, notwithstanding variation of the speed.
The first method is in general use for steam cranes; it allows for a far greater range of power in the brake, but is not automatic, as is the second.
The final settlement of a rule requiring brake-levers to be fitted on both sides of goods-wagons was, however, deferred, owing to objections raised by certain of the railway companies.
Had been laid, the cable snapped, owing to a mistake in the manipulation of the brake, and the ships returned to Plymouth with what remained.
The horsepower available at the driving-axle, conveniently called the brake horse-power, is from 20 to 30% less than the indicated horse-power, and the ratio, B.H.P./I.H.P. =E, is called the mechanical efficiency of the steam engine.
Thus this kind of brake, though cheap to make, is, when 0 is large enough, an exceedingly accurate measuring instrument, readily applied and easily controlled.
A and B are fast and loose pulleys, and the brake band is placed partly over the one and partly over the other.
Barrel cranes are usually fitted with band brakes, consisting of a brake rim with a friction band placed round it, the band being tightened as required.
The arrangements for this purpose vary, of course, with the amount of work to be done with one fixing of the machinery; where it is likely to be used for a considerable time, the drum and brake are solidly constructed, and the ropes of steel or iron wire carefully guided over friction rollers, placed at intervals between the rails to prevent them from chafing and wearing out on the ground.
Is 116,772 foot-pounds, and a brake 5 ft.
Other towns past which it flows between Munden and the sea are Karlshafen, Hoxter, Holzminden, Bodenwerder, Hameln, Rinteln,Vlotho, Minden, Stolzenau,Nienburg, Vegesack, Elsfleth, Brake, Geestemunde and Bremerhaven.
In one of these a copper disk, called the brake disk, revolves, and in the other a copper armature disk.