It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated trickle of material (historically sand) from the upper bulb to the lower one. Factors affecting the time interval measured include sand quantity, sand coarseness, bulb size, and neck width. Hourglasses may be reused indefinitely by inverting the bulbs once the upper bulb is empty.
Product Details :
Department : Unisex adult
Country of Origin : India
Item part number : NA123
ASIN : B08VGG9HQ3
Product Features :
This is a reproduction of Vintage Sand timers.This is new and unused sand timer.
It has two connected vertical glass bulbs allowing a regulated trickle of sand from the top to the bottom.
Once the top bulb is empty, it can be inverted to begin timing again.
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