The Locomotive - Lighthouse Survival Blog

140 THE LOCOMOTIVE lSeptember,
On a diagonal brace (which term will apply to any brace which is not parallel to
the direction of the stress applied to it, such as gussets, braces attached to heads and
having the other end attached to the shell, etc.), the strain is theoretically somewhat
greater than it would be if the brace were parallel to the direction of the stress applied.
Fig Showing Radial Arrangement of Tee-Irons.
The actual stress on the brace may be found by dividing the total pressure on the area
supported by the brace by the cosine of the angle between the brace and the direction
of the stress. Or, to arrive at the result without resorting to calculation, lay out the
EiG. 12. — Braces Used in Connection with the Radial Tee-Irons Shown Above.
brace in correct proportions, as shown in Fig. 15. Then, if the pressure on the area to
be braced is represented by the length of the line A B, the length of the brace B C,
measured on the same scale, will represent the actual stress upon it. With tlie ordinary
proportion of braces, this difference may be neglected ; but where the brace makes a
comparatively large angle with the shell, as may be the case with gusset stays, it should