JACOBUS
JAFFREY
of Cornelius and Catlieiine Garrison (Van AVage-
nen) Jacobus, and a descendant of RoelfT Jacobus,
who came from Holland to Essex county, N.J.,
before 16.")0. He was graduated at the College of
New Jersey in 1834, and at Princeton Theological
seminary in 1838, being instructor in Hebrew at
the latter in 1838. He was pastor of the First
Presbyterian churcli (afterward known as the
Second Presbyterian churcli), Brooklyn, N.Y.,
1SS39-.J1. In 18.")0-5l he travelled in Europe,
Ejjypt ami the East; was professor of oriental
and biblical literature in Western Theological
seminary at Allegheny CitN'.Pa., 1851-7G, serving
also as pastor of the Central Presbyterian chixrch
at Pittsbui'gh, Pa., 1858-70. He was moderator
of the general assembly in 1869, the last general
assembly of the old school, presiding, with the
moderator of the new school assembly, at the
reunion ceremonies at Pittsburgh in the autumn
of that year. He received the degree of D.D.
from Jefferson college in 1853, and that of LL.D.
from the College of New Jersey in 1867. He is
the author of: Letters on the Public School Ques-
tion; Notes on Mattheiv (1848); Mark and Luke
(1853): John (1856); Acts (1859); two volumes
on Genesis (1864-65), and one on Exodus (1874).
He died at Allegheny City, Pa., Oct. 28, 1876.
JACOBUS, flelanchthon Williams, educator, was born in Allegheny city. Pa. . Dec. 15, 1855; son of Melanchthon Williams and Sarah (Hayes) Jacobus. He was graduated from the College of New Jersey in 1877. and from Princeton Theolog- ical seminary in 1881. He studied at the Univer- sities of Gottingen and Berlin, Germany, 1881- 84, and was ordained by the pre.sbytery of Ches- ter, Oct. 15, 1884. He was pastor of the Presby- terian church at Oxford, Pa., 1884-91, and in 1891 was elected to the chair of New Testament exegesis and criticism at Hartford Theological seminary. He was made trustee of Lincoln university, Pa., in 1887; of the College of New Jersey, Princeton, in 1890, and was Stone lecturer at Princeton Theological seminary, 1897-98. He received the honorary degree of D.D. from La- fayette college, Pa., in 1892. He is the author of: Stone Lectures (1900).
JACOBY, Harold, astronomer, was born in New Y'ork city, March 4, 1865; son of ]\Iax and Eve M. (Jackson) Jacoby. His father was born in Gernuiny, and his mother was of English parentage. He was graduated from Columbia college in 1885, and was assistant astronomer of the U.S. expedition under Prof. David P. Todd, of Amherst, sent to West Africa to observe the total eclipse of the sun, Dec. 22, 1889. He was instructor in geodetic and practical astronomy at Columbia college, 1891-94, and became adjunct professor of astronomy there in 1894. He was made a fellow of the Royal Astronomical society
of London; a member of the Astronomische
Gesellschaft of Leipzig; a member of the coun-
cil of the New York Academy of Sciences, and a
fellow of the American Association for the
Advancement of Science, and was treasurer of
the American Mathematical society, 1891-94, and
1896-99. He is the autlior of several researches
on astronomical photography, stellar parallax
and star clusters, and of numerous articles on
astronomical subjects in various magazines and
newspai^ers.
JACOBY, Henry Sylvester, educator, was born in Springtown, Bucks county. Pa., April 8, 1857; son of Peter L. and Barbara (Shelly) Jacoby, and grandson of Benjamin and ^largaret (Landis) Jacoby and of John and Mary (Snyder) Shelly. His ancestor, Abraham Slielly, came from Germany and settled in!Milford, Pa. Henry studied at Carversville Normal institute, 1 870-72, and at the preparatory department of Le- high university, 1872-73, and was graduated from Lehigh university in 1877 with the degree of C.E. He was a member of the Lehigh topographical corps, second geological survey of Pennsj-lvania, in 1878: was transitman on gauging the Red river at Alexandria, La., and on the surveys of the Red river under an officer of a corps of en- gineers, U.S.A., 1878-79; was chief draughtsman in the U.S. engineer office at Memphis, Tenn., 1879-85; was bookkeeper and cashier to George W. Jones & Co., Memphis, 1885-86; instructor in civil engineering at Lehigh university, 1886- 90; assistant professor of bridge engineering and graphics at Cornell university, 1890-94; was promoted associate professor in June, 1894, and served until 1900, when he was made full profes- sor. He was elected a member of the American Association for the Advancement of Science in August, 1887; was made a fellow in 1892; an associate of the American Society of Civil Engineers, Nov. 5, 1890, and a member of the Society for the Promotion of Engineering Educa- tion, August, 1894. He was married. May 18, 1880, to Laura Louise Saylor. He was one of the editors of the Journal of the Engineering Society of Lehigh University, 1887-90, and is the author of: Notes and Pi-ohlems in Descriptive Geometry (1892); Outlines of Descriptive Geometry (1895- 97); Text-Book on Plain Lettering (1897), and Text-Book on Roofs and Bridges, with Professor Mansfield Merriman (1890-98).
JAFFREY, George, jurist, was born at Great Island, Newcastle, N.H., Nov. 22, 1682; son of George Jaffrey, an early counsellor of New Hampshire. He was gi'aduated from Harvard college in 1702, and was the first man of a liberal education to practise at tiie New Hampshire bar. He settled in Portsmouth, N.H., and represented Portsmouth in the ijrovincial assembly in 1710
