This clock uses two separate bulbs with a granular material inside and an opening connecting the two bulbs. This means that the granular material/ sand would fall down on the bulb down below due to the mere effect of gravity. However, there have been variations in hourglasses too that were made over time. For instance, though hourglass clocks have always been in ampoule shape, their bulbs were not always connected.
http://www.skyringecraft.com/sand-timer-hourglass/acrylic-sand-timer/
This clock uses two separate bulbs with a granular material inside and an opening connecting the two bulbs. This means that the granular material/ sand would fall down on the bulb down below due to the mere effect of gravity. However, there have been variations in hourglasses too that were made over time. For instance, though hourglass clocks have always been in ampoule shape, their bulbs were not always connected. http://www.skyringecraft.com/sand-timer-hourglass/acrylic-sand-timer/
China Acrylic Sand Timer Suppliers, Manufacturers, Factory - Wholesale Customized Acrylic Sand Timer at Low Price - SKYRINGE
SKYRINGE is one of the most professional acrylic sand timer manufacturers and suppliers in China, featured by cheap products and good service. Welcome to wholesale customized acrylic sand timer at low price from our factory. Contact us for free sample.
WWW.SKYRINGECRAFT.COM
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