[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.

That punching, or the forcible detrusion of a circular piece of metal
to form a rivet hole, has a more or less injurious effect upon the
metal plates surrounding the hole, is a fact well known and admitted