Background
He was born in Bath to an engineer and architect father, James Dredge, Senior, a brewer originally, who designed suspension bridges and piers. His father designed the Victoria Bridge in Bath in 1836, and the Birnbeck Pier in Weston-super-Mare in 1845, among over 50 others His mother was Anne Vine.
Education
James Dredge junior was educated at Bath Grammar School.
Career
He is best known for being co-editor of Engineering, illustrating, photographing and surveying many bridges in Britain in the latter part of the 19th century. There was also a sister, Elizabeth. Dredge was employed from 1858 to 1861 as an engineer in the office of Daniel Kinnear Clark.
In 1862, he was employed by John Fowler, and worked on the District Railway in London.
In January 1866, he ventured into engineering journalism, joining the weekly journal Engineering. In the late 1860s, he mainly illustrated for the journal, writing the occasional article, attending the great Paris Exhibition of 1867, where the journal writers "discovered a fund of new technology on which to report".
However, in 1870, on the death of editor Zerah Colburn, he became a co-editor of the journal with William Henry Maw. Maw not only considered Dredge to be a friend, but also his senior in technical matters.
As editor of Engineering, Dredge was a surveyor, documenting numerous bridges and photographing them in the 1890s.
A notable contribution was his. In 1901, he founded a monthly supplement to Engineering, a journal named Traction and Transmission, but it only lasted for three years. Dredge had an interest in the various international exhibitions held both in the United Kingdom and abroad.
As early as 1851, he served on the Royal Exhibition Commission.
He authored several works on them, notably on the Vienna Universal Exhibition (1873) with Maw and Alexander Kennedy, as well as the Paris International Exhibition (1878). He served as British commissioner at exhibitions at Chicago (1893), Antwerp (1894), Brussels (1897), and Milan (1906).
Dredge was a contributor to the Dictionary of National Biography, providing the extensive article on Henry Bessemer in 1901.
Membership
Dredge was a member of the Institution of Mechanical Engineers from 1874, the Institution of Civil Engineers from 4 February 1896, and several other engineering societies, and was appointed an honorary member of the American Society of Mechanical Engineers in 1886. Dredge was also a member of the council of the Society of Arts from 1890 until 1893.