Please note that at present some of the lay diagrams do not display quite correctly, as they were composed in an earlier release of HTML. The case edges may now show small boxes within the sides, and these should be ignored. The diagrams will be corrected in due course.
Type lays (listed in chronological order)
Note that the dates are those of the source used. In some case, eg MacKellar, Southward, there are earlier editions, which have not yet been consulted. Similarly, layouts observed in Museums, Presses, etc will have been in use some time before the date of observation, and in the case of Presses, also may be for some time after.
There is an extensive article on French case lays in Histoire de l'Écriture Typographique, Le XIX Siècle français, by Jacques André & Christian Laucou, Atelier Perrousseaux, 2013