"I have never seen one of those devices for stretching sheets and the like before ironing before, it looks rather useful to me"
In many parts of northern Europe tradition of kaltmangel (cold ironing) still holds. To fold long and large items such as sheets and table cloths into proper folds for putting through mangle (cold or heated) someone came up with that niffy device. It allowed one person to do the job easily instead of usual two.
On this side of pond we have "extra hand" or "third arm" folding devices that allow easier manual folding of large flatwork.
https://textileinnovations.com/gene...folder-bed-sheet-and-spread-folder-p-795.html
In many parts of northern Europe tradition of kaltmangel (cold ironing) still holds. To fold long and large items such as sheets and table cloths into proper folds for putting through mangle (cold or heated) someone came up with that niffy device. It allowed one person to do the job easily instead of usual two.
On this side of pond we have "extra hand" or "third arm" folding devices that allow easier manual folding of large flatwork.
https://textileinnovations.com/gene...folder-bed-sheet-and-spread-folder-p-795.html