This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
With dividers and compass lay off the width of the board into twice as many parts as the dovetails wanted. Draw a light line, AB, across the board as far from the end as half the thick-ness of the board. On this line step off the divisions with the dividers, beginning with a half space or division. With the bevel square, set to a bevel of 1 in. in 3, draw lines through the division dots. This method will save much time and give accurate results. - Contributed by Joseph F. Parks, Wichita, Kan.