United States or South Africa ? Vote for the TOP Country of the Week !
Unless the structure is small and its walls strong, its roof and sides are apt to be blown apart by this difference of pressure and the consequent expansion of the contained air. The blow of the air due to its rotative whirling has in several cases proved sufficient to throw a heavy locomotive from the track of a well-constructed railway.
In the Cornish engines, where the steam is cut off in some cases at one-twelfth of the stroke, a separate valve for the admission of steam, other than that which permits its escape, is of course indispensable; but in common rotative engines, which may realize expansive efficacy by throttling, a separate expansion valve does not appear to be required.
The senate is objected to as having too much power, and bold unfounded assertions that they will destroy any balance in the government, and accomplish what usurpation they please upon the rights and liberties of the people; to which it may be answered, they are elective and rotative, to the mass of the people; the populace can as well balance the senatorial branch there as in the states, and much better than in England, where the lords are hereditary, and yet the commons preserve their weight; but the state governments on which the constitution is built will forever be security enough to the people against aristocratic usurpations:—The danger of the constitution is not aristocracy or monarchy, but anarchy.
In modern rotative land engines, the valves for admitting the steam to the cylinder or condenser, instead of being clack or pot-lid valves moved by tappets on the air pump rod, are usually sluice or sliding valves, moved by an eccentric wheel on the crank shaft.
Word Of The Day