double-haversack

Updated: June 27, 2025

Then he will assume this double-haversack, the larger chamber of which, worn on the back, will contain a supply of air, whilst the smaller of the two, worn on the chest, is charged with a supply of chemicals for the purification of the air after it has been breathed.

Harry Collingwood - The Log of the Flying Fish: A Story of Aerial and Submarine Peril and Adventure