In work where high accuracy is required this instrument is
well adapted for filling in, and where a rough idea of the nature of a
given curve is required, the mirror being adjusted for any three
points upon it, the various elements may be read off on the scales. A
telescope is provided, but the errors not being cumulative, it is
rarely required. The curve ranger weighs 1 lb. 10 oz., and is
manufactured by Messrs. Elliott Bros., St. Martin's Lane, London. It
is the invention of Mr. Alex. P. Trotter, Westminster.--_The
Engineer._
* * * * *
THE RAIL SPIKE AND THE LOCOMOTIVE.[1]
[Footnote 1: Abstract from the History of the Camden and Amboy
Railroad. By J. Elfreth Watkins, of the National Museum,
Washington, D.C.]
Early in October, 1830, and shortly after the surveys of the Camden
and Amboy Railroad were completed, Robert L. Stevens (born 1787)
sailed for England, with instructions to order a locomotive and rails
for that road.
At that time no rolling mill in America was able to take a contract
for rolling T rails.
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