To simply mark the passage of time, as opposed to the actual hour, sand-glasses (or running glasses as English sailors called them) were used.
Ukuphawula msinya umlimandlela ngexesha ngokuchasene neyure zesiqhelo, neglasi zesenti (okanye ukubaleka kweglasi njengomatiloshe bamaNgesi bebiza boa) zazisetyenziswa.