108
"weakest part" I think it will be self-evident that the strain applied to the upper end was excessive, and that the strain applied to the lower end was too little to be of any value as a test of its stability, more so as it does not appear that any data were recorded for that purpose.
I therefore venture to suggest, that in future, the tests should be made as follows, viz.: The strain to be applied to the cable to be the weight of the cable 4 tons, passenger 1/2 ton, ballast 5½ tons, total 10 tons was not used, it is 14 tons. The ballast to be placed in the passenger car if practicable and the coal truck omitted, and each end of the cable to be subjected to the same strain of 14 tons.
This strain would then be three times more than the ordinary working load, and which I think could not be considered too excessive a strain on the cable whilst being tested.
Before applying the test, two brass or iron ferrules should be securely fixed, one on each end of the cable, by solder or other means, and no attempt whatever should be made to alter or remove their position on the cable without the knowledge and permission in writing of the Director of Public Works. The ferrules having been securely fixed, the cable should then be drawn tightly over guide pulleys, and the exact position of the two ferrules marked permanently on the iron rails of the tramway.
108
weakest part" I think it will be self evident that the strain. applied to the upper and was excessive, and that the strain applied to the lower and was too little to be of any valve
test of its stability, more as it does not appear was obtained.
Ad
A
especially
that
amy
data
or recorded for that purpose.
I therefore venture to suggest, that in future, the
tests should be made.
follows,
viz :. The strain to be applied to the cable to be the weight of the cable 4 tous, powenger 1/2 lous, ballast 51/2 tous, total 14 tous. The ballast to be
can
placea
the
passenger
car
if practicable and the cool truck amitted, and each end of the cable to be subjected to the same strain of 14 tous.
This
This stain would then be three
than the ordinary
Love
working load, and which I
think could not be considered
too excessive a strain on the
cable whilst being tested.
Before applying the text; two brass or iron ferrules should be securely fixed, one on each
of the cable, by solder or
ena
other
and
no accomp
whatever should their position
on the cable be altered or removed without the knowledge
of
and permission in writing of the Director of Public Works. The ferrules having been securely
frised the cable should then
over the
and the exact
be drawn tightly quide pulleys, -position of H. two ferrules.
marked permanently on the iron rails of the Framway,
my
No comments yet.
Private notes are available after approval.