XU

CONTENTS.

Page

Rectangular tubes. 234

Apparatus for experimenting on the model tube . 251

Summary of results of the experiments on the rectangular tubes. 267

General deductions from the experiments . 268

Investigation of formulae . 273

Experiment on the resistance of a rectangular tube to a crushing force 282

Experiments to determine the strength of rivets . 284

Letters from Mr. H. Ross, Mr. J. Graham, and Mr. R. Murray. 289