1. The tangents are made to conform to the falling line of rail,
instead of the falling line having to conform to the tangents, as is
the case in most systems.
2. The wreath being sawn out to the section lines instead of vertical,
as is the case with cylindrical wreaths, saves more than half the time
in squaring.
3. The wreath being straight across on the inside and outside in the
direction of the section line, instead of concave on the inside and
convex on the outside, as is the case with a cylindrical wreath, is
much easier to mould, and has a much better appearance by far when
finished.
4. It has all the advantages of falling moulds without the trouble of
getting them out, and it can always be ascertained what any part of the
falling line is out of the centre of the plank.
5. It takes the minimum thickness of stuff, as it can always be seen
exactly what thickness will be required.
6. The system of bevelled joints does away with the short ramps, and
thereby saves both labour and material; besides there is only one joint
instead of three.
It will be seen that in no case in this book is extra thickness of
stuff required.
[Illustration: PLATE 12.]