Boron fluoride BF 3 was first prepared in 1808 by Gay Lussac and L.
Boron fluoride also combines with ammonia gas, equal volumes of the two gases giving a white crystalline solid of composition BF 3 NH 3 i with excess of ammonia gas, colourless liquids BF 3.2NH 3 and BF 3.3NH 3 are produced, which on heating lose ammonia and are converted into the solid form.
If, then, the speed of the ship be v, the rate of paying out u, the angle of immersion i, the depth of the water h, the weight per unit length of the cable w, the pull on the cable at the surface P, and A, B constants, we have P =ht w- (A/sin i)f(u-v cos i)} (a) and w cos i= Bf (v sin i) (3), where f stand for " function."
The factors Af (u-v cos i) and Bf (v sin i) give the frictional resistance to sinking, per unit length of the cable, in the direction of the length and transverse to the length respectively.
Burghers of all denominations are enrolled in one or other of the arts or gilds, and these trading companies furnish the material from which the government or signoria bf the city is composed.
And Bf ol.
Moreover the second term on the left contains (a f)' c -2b z 2 = 2 (a f) k-2b x 2 - (b) /0-2a 2 ï¿½ if k be uneven, and (af)?'bx (i f) of) '-la if k be even; in either case the factor (af) bx - (bf) ax = (ab) f, and therefore (n-k),bk+1 +Mï¿½f = k(n-2)f.(uf)uxn-2k-1; and 4 ' +1 is seen to be of the form f .14+1.
About 512 B.C. Darius, having conquered Thrace, made an invasion bf Scythia, which, according to the account of Herodotus, he crossed as far as the Oarus, a river identified with the Volga, burned the town of Gelonus and returned in sixty days.
In 1357, however, Alphonso died, and the infante was crowned king bf Portugal.
The hardships of a campaign cause him little sufferin~ since he never frets over them, but the hour of combat finds him forgetful bf everything save victory.
Cuvcs dealt with natural science, the P ecorrovcKa with agriculture, and `Iepo,uvi bF twv with theology.
EF is the change of volume corresponding to a change of pressure BE when no heat is allowed to escape and the path is the adiabatic BF, EC is the change of volume for the same change of pressure BE when the path is the isothermal BC. These changes of volume are directly as the compressibilities, or inversely as the elasticities.
He had much bf the Arab nature, was singularly temperate, and equal to any amount of fatigue.
Hewett for the seizure bf the Suez canal.
A considerable amount bf the bark from private plantations is bought by the government and treated at the government factories.
After reaching manhood, he passed through the tempestuous period between the death of Theodosius (395) and the fall bf the usurper Attalus, which occurred near the date when his poem was written.