The
underground system is even more expensive, especially in view of the
tremendous outlay for damages. This goes to show that money has not
been spared to obtain rapid transit.
After all, the means to be depended upon when one desires to make a
rapid trip from one part of the city to another is the really
admirable, cheap, always ready, convenient and comfortable London
hansom; while the way to see London is from the top of an omnibus, the
most enjoyable, if not the most expeditious, means of conveyance.
* * * * *
[Continued from SUPPLEMENT, NO. 809, page 12930.]
RIVETED JOINTS IN BOILER SHELLS.[1]
[Footnote 1: A paper read at a meeting of the Franklin Institute.
From the journal of the Institute.]
By WILLIAM BARNET LE VAN.
[Illustration: FIG. 11.]
Fig. 11 represents the spacing of rivets composed of steel plates
three-eighths inch thick, averaging 58,000 pounds tensile strength on
boiler fifty-four inches diameter, secured by iron rivets
seven-eighths inch diameter. Joints of these dimensions have been in
constant use for the last fourteen years, carrying 100 pounds per
square inch.
_Punching Rivet Holes._--Of all tools that take part in the
construction of boilers none are more important, or have more to do,
than the machine for punching rivet holes.
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