sandglasses's Usage Examples:

The sandglasses were later replaced by pendulums.

For ships at sea, boys were used to turn the sandglasses and to call the hours.

" Marine sandglasses were very popular on board ships, as they were the most dependable measurement.

Although vital to maritime navigation, marine sandglasses were not.

1861 the first time limits, using sandglasses, were employed in a tournament match at Bristol, England.

The collection is made up of premechanical timekeepers (sundials, sandglasses, water and fire clocks) as well as clocks and watches from around the.

marine sandglasses were also used to measure the boat speed through the water in knots.