Introduction : the measured heart
Clocks, clock times, and social change
'Not everyone occupies the same now' : reconceptualizing clock time
Clock times in medieval and early modern Bristol
The provision of clock time in pre-modern England
Clock times in everyday lives
Precision in everyday lives
'Posted within shot of the grave' : seafaring times
The pursuit of precision
Clocks from nowhere? : John Harrison in context
Some concluding remarks.