Send a strong swimmer across first with one end of a rope, and tie the other end onto a nearby tree. Make the chair and fasten it to a running look or a block pulley, tie a light rope to the middle of the chair, and have someone at each end who can pull the rope. In no time you’ve got an easy rope crossing for the non-swimmers in your party.
“Dissolve one pound of salt and half a pound of sal-ammoniac in two quarts of water and bottle the liquor in thin glass bottles holding about a quart each”. Apparently if a fire breaks out, you can smash a bottle in the flames and it will help put out the fire.