This section is from the book "Safe Building", by Louis De Coppet Berg. Also available from Amazon: Code Check: An Illustrated Guide to Building a Safe House.
(German, Schwerpunkt; French, Centre de gravite.) The centre of gravity of a figure, or body, is that point upon which the figure, or body, will balance itself in whatever position the figure or body may be placed, provided no other force than gravity acts upon the figure or body.
To find the centre of gravity of a plane figure, find two neutral axes, in different directions, and their point of intersection will be the centre of gravity required.