Identifier: railroadengineer65newy (find matches)
Title: The railroad and engineering journal
Year: 1887 (1880s)
Authors:
Subjects: Railroad engineering Engineering Railroads
Publisher: New York : M.N. Forney
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
allowed, and the greater the mass, the larger are thecrystals obtained ; their planes of cleavage are also moreclearly defined, and are more easily separated from eachother, or, in fact, have a less amount of cohesion. A cast ingot of 1 ft. square, quietly reposing in a soak-ing pit or heating furnace, may go on crystallizing for twoor three hours, and develop a coarse crystalline structure,but, in rolling fluid steel in the manner proposed, we have,in place of a lo-in. ingot, a sheet of one-hundredth of thatthickness only, and in lieu ^of the two or three hours 556 THE RAILROAD AND (Dectmber, 189I. i».,. „^..cf-it -Jl
Text Appearing After Image:
Vol. LXV, No. li.) ENGINEERING JOURNAL. 557 allowed in ordinary cases for the development of crystals,we have, when using a 4-ft. pair of rolls, making fourrevolutions per minute, a transition from absolute fiuidityto absolute solidity in just one-half of a second of time, ina mass of only ^\f in. in thickness ; and if crystals are de-veloped at any period during the half second oi time oc- the mill to be fitted with a pair of 4-ft. diameter rolls,18 in. wide, and making four revolutions per minute, andset to produce a sheet having an initial thickness of ,,, in.,and rolled by the third pair to ijV in., we should thus havea surface velocity of the first pair of rolls equal to 50 It.per minute ; and making when finished 100 plates 18 in.

Note About Images