The trouble with a lot of these old drawings is that they leave as many questions unanswered as they actually provide.
1) Why is that top template slid over to the right a bit ?
2) The top template is laid on top of the new tangent lines ('new' as in the new tangent lines drawn after the bevel has been marked on the ends of the blank). Correct ?
3) The ends of the top template are square to the new tangent on the template as is the face of the block its laid on. Correct ?
4) The drawing doesn't make clear if the tangents on the bottom template are lined up with the new tangents that have been offset from those on the top surface by virtue of the angle of the bevel. I assume that they are ...yes?
5) Assuming that all of the above are true, what the drawing does not make clear is that the ends of the bottom template will not line up at the same angle on the face of the block as they did on the upper template. This is because relative to the top template, the bottom template is skewed round. This can perplex anyone new to this. As it did me until I realised that this was how it was meant to be.
6) The drawing does not mention that the way the bevels are oriented is only valid for a particular type of wreath and that the bevels could lean the other way, or not at all or only lean one-way and the other remain square to the centre line. This confused the hell out of me.