No. LXXXIII.
Reading edition
A rasping-mill for hartshorn, whereby a child may do the work of half-a-dozen men, commonly taken up with that work.
NOTE.
A variety of engines have been invented for this purpose, many of which are capable of effecting the saving of labour described by the Marquis, as at that period (1663) the process was usually effected by rubbing the horn or ivory over a common iron grater.