Maritime hour glass with reversible case/wall bracket. Half-hour measure; used to determine ship's speed in knots.
hourglasses
wood (plant material)
glass (material)
sand
shipping
Wood
Glass
Sand
Hourglass
Original to Cogswell's Grant (Essex, Mass.),
Unknown
9 3/4 x 6 x 5 1/2 (HxWxD) (inches)
Gift of Bertram K. and Nina Fletcher Little
1991.1645
Massachusetts (United States)
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