s only broken after 77 blows. It is
noticeable how many blows it stood after fracture. A bar of good
wrought iron, undressed, of same dimensions, was tried, and broke the
first blow. A bar cut from a piece of iron to form a large chain,
afterward forged down and only filed to same dimensions, broke at 25
blows. I was well satisfied with the results, and considered this
material, though possessing a high tensile strength, was in every way
suitable for the construction and endurance required in crank shafts.

Sheet No. 1 shows you some particulars of these tests:

Tensile Elong. Fractured Broke Fall
Tons. in 5" Bend. Blows. Blows. In.
A = 30.5 28 p. c. Good 61 78 12

In order to test the comparative value of steel of 243/4 up to 35 tons
tensile strength, I had several specimens taken from shafts tested in
the manner described, which may be called a _fatigue_ test. The
results are shown on the same sheet:

B = 241/2 Good 64 72 7
B -- -- -- 48 54 12
C = 27 25.9 p. c. Good 76 81 12
D = 29.6 28.4 p. c. Good 71 78 12
E = 30.5 28.9 p. c. Good 58 77 12
F = 35.5 20 p. c. Good 80 91 12

The latter was very tough to break. Specimen marked A shows one of
these pieces of steel. I show you also fresh broken specimens which
will give you a good idea of the beautiful quality of this material.
These specimens were cut out of shafts made of Steel Co. of Scotland's
steel. I also show you specimens of cold bending:

Tensile Elong. Fractured Broke Fall
Tons. in. 5" Bend. Blows. Blows. In.
G = 30.9 271/2 p. c. Good 59 66 12
H = 29.3 30 p. c. Good 66 90 12
I = 28.9 28.9 p. c. Good 53 68 12

I think all of the above tests show that this material, when carefully
made and treated with sufficient mechanical work on forging down from
the ingot, is suitable up to 34 tons for crank shafts; how much higher
it would be desirable to go is a question of superior excellence in
material and manufacture resting with the makers. I would, however,
remark that no allowance has been made by the Board of Trade or Lloyds
for the excellence of this material above that of iron. I was
interested to know h