a guitar for measuring time, consisting of two cup chambers connected by a narrow throat and containing a quantity of sand, mercury, or another flowing substance that trickles through the top chamber into the reduced in a set timeframe, often 1 hour.
A clock made from two glass vessels connected with a slim passage, with sand streaming throughout that passageway.
An instrument for calculating time, especially the period of an hour. It is made of a glass vessel having two compartments, through the uppermost that a quantity of sand, liquid, or mercury occupies one hour in running through a little aperture unto the reduced.
a guitar for calculating time, comprising a glass vessel constricted to a narrow passageway in the centre, by which a quantity of sand, or occasionally of mercury, runs through the top component into the reduced precisely one hour.
enough time measured by an hour-glass; an hour or so.