...Plusieurs des courtines de Nuremberg sont munies de crénelages en bois posés au-dessus des parapets, percés d'embrasures pour les bouches à feu, ainsi que l'indique la fig. 18. Évidemment ces crénelages en bois, qui rappellent les hourds du moyen âge, ont été prévus lors de la construction des courtines, car les glacis arrondis dans lesquels sont percées les embrasures sont garnis de corbeaux en pierre destinés à porter ce crénelage en pans-de-bois....

This image comes from Dictionary of French Architecture from 11th to 16th Century (1856) by Eugène Viollet-le-Duc (1814-1879).

	This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse