Judge Chase was defended by the ablest lawyers in the country, including Luther Martin, Robert Goodloe Harper (1765-1825), Philip Barton Key (1757-1815), Charles Lee (1758-1815), and Joseph Hopkinson (1770-1842).
Hopkinson supplied a precise meaning (Phil.
The small magnet may be a sphere rigidly magnetized in the direction of Ho; if this is replaced by an isotropic sphere inductively magnetized by the field, then, for a displacement so small that the magnetization of the sphere may be regarded as unchanged, we shall have dW = - vIdHo = v I+-, whence W = - 2 I + H2 ° (37) The mechanical force acting on the sphere in the direction of displacement x is 1 Hopkinson specified the retentiveness by the numerical value of the " residual induction " (=47rI).
Trans., 188 5, 1 7 6, 549; Hopkinson, Phil.
Hopkinson pointed out that the greatest dissipation of energy which can be caused by a to-and-fro reversal is approximately represented by Coercive force X maximum induction fir.
Temperature, Morris's results are in general agreement with those of Hopkinson, though no doubt they indicate details with greater clearness and accuracy.
Hopkinson for nickel-steel.
- A most remarkable effect of temperature was discovered by Hopkinson (Proc. Roy.
Alloys And Compounds Of Iron In 1885 Hopkinson (Phil.
Hopkinson (Proc. Roy.
JOHN HOPKINSON (1849-1898), English engineer and physicist, was born in Manchester on the 27th of July 1849.
Dr Hopkinson presented a rare combination of practical with theoretical ability, and his achievements in pure scientific research are not less intrinsically notable than the skill with which he applied their results to the solution of concrete engineering problems. His original work is contained in more than sixty papers, all written with a complete mastery both of style and of subject-matter.
Hopkinson, working at Chance's glass works, subsequently made an attempt to produce a titanium silicate glass, but nothing further resulted.
Hopkinson in the Proc. Lond.
Hopkinson, " On the Residual Charge of the Leyden Jar," Phil.
It was the home for some years of Francis Hopkinson and of his son Joseph Hopkinson (whose residences are still standing), and from 1817 to 1832 and in 1837-1839 was the home of Joseph Bonaparte, ex-king of Spain, who lived on a handsome estate known as "Bonaparte's Park," which he laid out with considerable magnificence.
1848), John Hopkinson (1849-1898), J.
Hopkinson and others.
3), which was designed by Richard Whittaker Cope, was afterwards much improved upon by John Hopkinson (1849-1898).
Hopkinson found, however, before 1885, that the above formula does not agree with observed facts (Proc. Phys.
The formula indicates that the sensibility of the instrument should increase with the charge of the Leyden jar or needle, whereas Hopkinson found that as the potential of the needle was increased by working the replenisher of the jar, the deflection due to three volts difference between the quadrants first increased and then diminished.
Sumpner, who in 1886 had noticed the same fact as Hopkinson, investigated the matter in 1891 (Proc. Roy.
Hopkinson had been inclined to attribute the anomaly to an increase in the tension of the bifilar threads, owing to a downward pull on the needle, but they showed that this theory would not account for the discrepancy.
Two points are selected on the surface of the shaft at different positions along it, and the relative displacement which occurs between them round the shaft when power is being transmitted is determined either by electrical means, as in the Denny-Johnson torsion-meter, or optically, as in the Hopkinson-Thring and Bevis-Gibson instruments.
FRANCIS HOPKINSON (1737-1791), American author and statesman, one of the signers of the Declaration of Independence, was born in Philadelphia, Pennsylvania, on the 2nd of October 1737.
He was a son of Thomas Hopkinson (1709-1751), a prominent lawyer of Philadelphia, one of the first trustees of the College of Philadelphia, now the University of Pennsylvania, and first president of the American Philosophical Society.
His son, Joseph Hopkinson (1770-1842), graduated at the University of Pennsylvania in 1786, studied law, and was a Federalist member of the national House of Representatives in 1815-1819, Federal judge of the Eastern District of Pennsylvania from 1828 until his death, and a member of the state constitutional convention of 1837.