This place sells #1 by the roll but you can get #4 by the yard. I haven't used this place but it looks promising:
The mattress was an 1870's one at the Mariner's Museum in Newport News, Va. but follows period descriptions of them.
It basically is a pad of horsehair batting with a lightweight canvas cover. It was tacked in offset tacks about 10" apart. It was 66-1/2" long, 27" wide, and 2-1/2" thick. I think it had a lightweight twill cotton slip cover. I'll have to dig up my notes to check that.
--- In firstname.lastname@example.org, "mikestein555" <mestein@...> wrote:
> Cool. Who did you source your canvass from? My last internet search was unsuccessful in finding Canvas #1. Also, I heard about the horse hair mattress being 2" thick but not much else. Do you have any further information on this? Was it ticked? woven? felted?