VAJEN-BADER SMOKE PROTECTOR --the actual description from an 1896 Vajen-Bader Catalor:

“The wearer of the Vajen helmet can see through eye-pieces that were guarded by cross wires. Over his ears the plates of the helmet are contructed as to furnish him with an artificial tympanum, rendering his hearing even more distinct than natural. There is a whistle in the front bottom part of the helmet which is a means of calling and signaling. On top of the helmet there is a strong cushion protecting the head from falling debris. This helmet enables the firemen to venture into thick smoke without fear of suffocation.”