Cash
I made it on the bevel.
There is more surface for the nails to grip.
There is twice the gripping-surface to each seam.
The water will have to seep into it on a slant. Water moves easiest up and down or straight across.
In a house people are upright two-thirds of the time. So the seams and joints are made up-and-down. Because the stress is up-and-down.
In a bed where people lie down all the time, the joints and seams are made sideways, because the stress is sideways.
Except.
A body is not square like a crosstie.
Animal magnetism.
The animal magnetism of a dead body makes the stress come slanting, so the seams and joints of a coffin are made on the bevel.
You can see by an old grave that the earth sinks down on the bevel.
While in a natural hole it sinks by the centre, the stress being up-and-down.
So I made it on the bevel.
It makes a neater job.