'The sand in this simple device runs from the top bulb to the bottom in 60 minutes' time'
hourglass
NON-MUSICAL INSTRUMENTS: The sand in this simple device runs from the top bulb to the bottom in 60 minutes' time
The sand in this simple device runs from the top bulb to the bottom in 60 minutes' time
The sand in this simple device runs from the top bulb to the bottom in 60 minutes' time
NON-MUSICAL INSTRUMENTS
hourglass
NON-MUSICAL INSTRUMENTS