• 07.116 and joining into figure-eights,

Sometimes “figure-of-eight”.  This must mean that the numeral for the concept of eight was shaped like 8, since that’s the only logical shape described here.

“eight, adj. and n.” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/59981. Accessed 13 September 2017.

• 06.100 more soundly than ever he had done on his feather-bed

A word attested in OED.

“ˈfeather-ˈbed, n.” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/68813. Accessed 13 September 2017.