In article ,
D.M. Procida wrote:
Is it better to have the brackets at 1/3 and 2/3 distance along the
shelf, or 1/4 and 3/4 distance? Or is the optimum figure somewhere in
between?

How long is the shelf?

About 1.2m.

I'd go for three, the outer ones about 150mm in from the ends. Books can
weigh rather a lot.

--
*I never drink anything stronger than gin before breakfast *

Dave Plowman London SW 12
RIP Acorn