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![Two hour-glasses together expl4256.jpg Two hour-glasses together](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_expl4256.jpg?itok=DuG0FFkY)
Description
Two hour-glasses together. Possibly these were used with log line to measurespeed of vessel through water. Wreck 15577 (Image credit: NOAA Okeanos Explorer Program)
Credit
NOAA Okeanos Explorer Program
Display Date
2012 April 27
Collection
Voyage to Inner Space