It is the author's hope that
the following text may be of service to apprentices to the
trade, to vocational and trade school students, and to
manual training students.
The author's experience as a
carpenter leads him to feel that not a few Journeyman
carpenters may find their horizon widened and their
usefulness as framers of the unusual roof increased by a
study of Chapter IV where an effort has been made to
indicate how the principles involved in framing the square
and octagonal roof may be "generalized" so as to make
possible their application to roofs of any number of sides.
Beyond this, the book makes claims to being nothing more
than an elementary treatise of the essentials of carpentry.
No apology is offered for making use of trigonometric
solutions of plane right triangles as a basis for developing
generalized roof framing principles in Chapter IV. There is
absolutely nothing in the use of natural trigonometric
functions to prevent their introduction early in the
mathematical experience of a boy, except academic tradition.
The author has made use of this mathematical tool with upper
grammar grade boys with less effort upon their part in
mastering the principles than was expended in mastering
The ease with which roof framing problems lend
themselves to solution by the use of natural trigonometric
functions and the readiness with which problems may be
generalized thereby has emboldened the author to make use of
it in a text as elementary as this.
No previous knowledge of
trigonometry is presupposed, the Appendix provides all the
information required for the solution of any problem given
Should a reader, because of lack of time or for any other
cause, not care to consider more than roof framing of the
square cornered building, he will find a complete treatise
in Chapter III without reference to solutions other than by
common arithmetic. Appendix
IV offers a still more abbreviated approach to both square
and octagonal roof framing.
The greatest good in studying the chapter on ''Estimating"
will come only when each student is provided with a set of
plans and specifications completely drawn, as by a
Plans and specifications, such
as will serve the purpose, can be purchased at small cost
from architectural companies, should local architects be
unwilling to provide sets for the schools. Also, there must
be provided for each student, catalogs of lumber and
millwork specifications and prices. These can be obtained
from mail order lumber and millwork companies. As a rule,
local lumber and millwork companies are glad to provide such
data, but it must be in a form complete, and readily
accessible to be of the greatest value.
Ira S. Griffith.