Visorless helmets from World War I

Historian and writer Thomas Wictor has wrote an article on his homepage about usage of visorless helmets by all armies of the Central Powers ( German, Austro-Hungarian, Ottoman and Bulgarian). For more info, check out the article here. Also, I recommend that you sign up for Thomas newsletter for more exciting information in the future. 

http://www.thomaswictor.com/visorless-steel-helmets-central-powers/