Weaving asbestos fibre into a boat or strong vessel
Make cords of plume-alum (asbestos) and weave them like sacks for walnut oil.
A practical recipe for working plume-alum (allume di piuma, i.e. asbestos): make it into little cords, weave them as sacks are woven for pressing walnut oil, and from that fashion a boat or a strong vessel just as one would from leather. Leonardo adds that one should take some of the material at hand and try combing it out like an ox's sinew. The full page carries this note in dark mirror-writing with no diagram.
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Weaving plume-alum (asbestos) into fireproof containers
To make a boat or a strong vessel, take plume-alum and make little cords of it, weave them as sacks are woven for pressing walnut oil, and of that make a boat as you would from leather. Take some of what is in the house and with it try to comb it like an ox's sinew.