noun
definition
A pound (unit of weight).
definition
Leg bye
Examples of lb in a Sentence
In order to be sure that the heat was not due to the action of the air upon the newly exposed metallic surface, the cylinder and the end of the boring bar were immersed in 18-77 lb.
In 1878, 65,000,000 sheep yielded 230,000,000 lb weight of wool, or an average per sheep of about 32 lb.
In the season of 1899-1900 the wool exports weighed 420,000,000 lb, and averaged more than 5 lb per sheep. The extra weight of fleece was owing to the large importation of better breeds.
Of the larger kangaroos, which attain a weight of 200 lb and more, eight species are named, only one of which is found in Western Australia.
A very fine freshwater fish is the Murray cod, which sometimes weighs Too lb; and the golden perch, found in the same river, has rare beauty of colour.
Among the sea fish, the schnapper is of great value as an article of food, and its weight comes up to 50 lb.
Victoria produced already more wool than New South Wales,the aggregate produce of Australia in 1852 being 45,000,000 lb; and South Australia, between 1842 and this date, had opened most valuable mines of copper.
The total catch in 1895 was 208,139 lb, valued at $7160, and in 1902 was 528,682 lb, valued at $37,669.
The wall-eyed pike taken in 1902 were valued at $16,915 (210,936 lb); white fish, $5777 (80,191 lb); pickerel, $4144 (51,711 lb); yellow perch, $ 2 575 (43,9 1 7 lb); sturgeon, $20 5 1 (1 5,59 0 lb), and suckers, $ 18 54 (37,375 lb); other varieties taken in smaller quantities included smelt, sun-fish and eels.
Its weight varies from 48 to about 55lb the cubic foot, but in very hard slowly-grown trunks sometimes approaches 60 lb.
The wood is very heavy and hard, weighing 70 lb the cubic foot; the colour is dark brown; it is used in Spain and Italy for furniture, and in the former country for firewood and charcoal.
Cotton growing under European direction began about 1900, with the result that in 1901-1902 over 100,000 lb of cotton grown from native, American and Egyptian seed were shipped to Bremen.
If we raise i lb of matter through a foot we do a certain amount of work against the earth's attraction; if we raise 2 lb through the same height we do twice this amount of work, and so on.
Also, the work done in raising i lb through 2 ft.
Rumford then turned up a hollow cylinder which was cast in one piece with a brass six-pounder, and having reduced the connexion between the cylinder and cannon to a narrow neck of metal, he caused a blunt borer to press against the hollow of the cylinder with a force equal to the weight of about ro,000 lb, while the casting was made to rotate in a lathe.
Taking into account the heat absorbed by the box and the metal, Rumford calculated that the heat developed was sufficient to raise 26.58 lb of water from the freezing to the boiling point, and in this calculation the heat lost by radiation and conduction was neglected.
With an apparatus similar to the above, but smaller, made of iron and filled with mercury, Joule obtained results varying from 772.814 foot-pounds when driving weights of about 58 lb were employed to 775.352 foot-pounds when the driving weights were only about 192 lb.
Copper wire weighing 600 and 800 lb per mile has also been used to some extent.
Gutta-percha-covered copper wires were formerly largely used for the purpose of underground lines, the copper conductor weighing 40 lb per statute mile, and the gutta-percha covering 50 lb (90 lb total).
Between London and Birmingham a paper cable 116 m long and consisting of 72 copper conductors, each weighing 150 lb per statute mile, was laid in 1900.
The central conductor is covered with several continuous coatings of guttapercha, the total weight of which varies between 70 and 650 lb to the mile.
As subscribers' lines are invariably short, the smallest gauge of wire possessing the mechanical strength necessary to withstand the stresses to which it may be subjected can be employed, and bronze wire weighing 40 lb per mile is commonly used.
The conductors used for subscribers' circuits are of copper weighing from 10 to 20 lb per mile.
Junction circuits are usually made up of 20 or 40 lb conductors.
Wire weighing between 150 and 400 lb per mile is generally used.
These vary in weight from soo to 1000 lb, according to the variety of camel employed, for of the Arabian camel there are almost as many breeds as there are of the horse.
In Sicily the so-called Modica race is of note; and in Sardinia there is a distinct stock which seldom exceeds the weight of 700 lb.
The regulations provide that if there is a greater weight of correspondence (including bookpackets) than 13/4 lb for any individual by any one delivery, notice shall be given him that it is lying at the post office, he being then obliged to arrange for fetching it.
Tobacco slightly diminished in weight at a little over I lb per head, while the gross receipts are considerably increasedby over 23/4 millions sterling since 1884-1885---showing that the quality consumed is much better.
It attains to a weight of 15 lb.
In the deltas of shoal rivers, with a strong tide or current and no land visible, a 5 lb lead is substituted for the log-ship; the lead rests on the bottom, and the speed is obtained in a manner similar to that previously described.
No less than 96% of the world's supply of platinum comes from the Urals; but the total output only ranges between 10,000 and 16,000 lb annually.
As used by George Stephenson on the Stockton & Darlington and Whitstable & Canterbury lines they weighed 28 lb per yard.
The fishbellied rails, however, were found to break near the chairs, and from 1834 they began to be replaced with parallel rails weighing 50 lb to the yard.
The fare was is., and each passenger was allowed to take baggage not exceeding 14 lb weight.
The chairs on the British system weigh about 45 or 50 lb each on important lines, though they may be less where the traffic is light, and are fixed to the sleepers each by two, three or four fastenings, either screw spikes, or round drift bolts entered in holes previously bored, or fang bolts or wooden trenails.
The rails, which for heavy main line traffic may weigh as much as too lb per yard, or even more, are rolled in lengths of from 30 to 60 ft., and sleepers are placed under them at intervals of between 2 and 3 ft.
The standard specification adopted by the Pennsylvania railway in 1908 provided that in rails weighing Ioo lb to the yard 41% of the metal should be in the head, 18-6% in the web, and 40-4% in the base, while for 85 lb rails 42.2% was to be in the head, 17-8% in the web and 40.0% in the base.
According to the specification for 85 lb rails adopted by the Canadian Pacific railway about the same time, 36-77% of the metal was to be in the head, 22'21% in the web and 41 02% in the base.
Thus if R is equal to 10,000 lb when the velocity is 44 ft.
From Aspinall's experiments it appears to be about 17 lb per ton, and this value is plotted on the diagram.
Hence Engine resistance, R e = 80 X20 = 1600 lb Vehicle resistance, R v =200 X8.5 = 1700 „ Train resistance, R = 3300 „ The speed, 40 m.
The maximum rate of combustion may be as much as so lb of coal per square foot of grate per hour, and in exceptional cases even a greater rate than this has been maintained.
A few experimental results are set forth in Table XX., from which it will be seen that with a relatively low rate of combustion, a rate which denotes very light service, namely lb of coal per square foot of grate per hour, the efficiency of the boiler is %, which is as good a result as can be obtained with the best class of stationary boiler or marine boiler even when using economizers.
Let the boiler pressure be 175 lb per square inch.
Taking 85% of this, the maximum mean effective pressure would be 149 lb per square inch.
The engine can only exert this large tractive force so long as the mean pressure is maintained at 149 lb per square inch.
Thus although at a slow speed the engine can exert a tractive force of 18,600 lb, at 60 m.
It will be seen at once that with a tractive force of 7400 lb a weight of 37,000 lb (=16.5 tons) would be enough to secure sufficient adhesion, and this could be easily carried on one axle.
This would be an ideal performance for an engine receiving steam at 190 lb initial pressure absolute, and rejecting steam at the back pressure assumed above, and could never be attained in practice.