To Mrs. Laura Frazer of Hannibal, Mo., Mark Twain's immortal "Adventures of Tom Sawyer" is a rosary, and the book's plot is the cord of fiction on which beads of truth are strung. In the sunset of her life she tells them over, and if here and t... Read more of MARK TWAIN'S FIRST SWEETHEART, BECKY THATCHER, TELLS OF THEIR CHILDHOOD COURTSHIP at Difficult.caInformational Site Network Informational
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Steel Making

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Steel is hardened by quenching from above the upper critical....

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Furnace Data
In order to give definite information concerning furnaces, fu...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

Impact Tests
Impact tests are of considerable importance as an indication ...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Silicon prevents, to a large extent, defects such as gas bubb...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

The Modern Hardening Room
A hardening room of today means a very different place from ...

Pickling The Forgings


The forgings were then pickled in a hot solution of either niter
cake or sulphuric acid and water at a temperature of 170 deg.F., and
using a solution of about 25 per cent. The solution was maintained
at a constant point by taking hydrometer readings two or three
times a day, maintaining a reading of about 1.175. Sixty forked or
one hundred single rods were placed in wooden racks and immersed
in a lead-lined vat 30 by 30 by 5 ft. long. The rack was lowered
or lifted by means of an air hoist and the rods were allowed to
stay in solution from 1/2 to 1 hr., depending on the amount of
scale. The rods were then swung and lowered in the rack into running
hot water until all trace of the acid was removed.

The rod was finally subjected to Brinell test. This shows whether
or not the rod has been heat-treated to the proper hardness. If
the rods did not read between 241 and 277, they were re-treated
until the proper hardness is obtained.

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