Product Details

SAND WATCH KELVIN & HUGHES SAND TIMER HOUR GLASS

sand timer
 
 
Name SAND WATCH KELVIN & HUGHES SAND TIMER HOUR GLASS
Description History of the Hourglass Sand Timer The hourglass, also known as a sand timer, sand glass, or sand clock, is a device traditionally used for the measurement of time. It consists of two glass bulbs resting one on top of the other connected by a narrow opening. The top bulb is filled with sand which flows through the opening into the lower bulb at a given rate dependent on the volume and size of the sand and size and angle of the glass bulbs. The hourglass can then be inverted and the sand will again flow from bulb to bulb. Alternatives to sand are used in some instances. Since the hourglass was one of the few reliable methods of measuring time at sea, it has been speculated that it was in use as far back as the 11th century, where it would have complimented the magnetic compass as an aid to navigation. Not until the 14th century is there actual evidence of their existence, appearing in a painting by Ambrogio Lorenzetti in 1328. The earliest written records come from the same period and appear in lists of ship stores. From the 15th century on they were being used widely at sea, in churches, in industry, and for cooking. They were the first dependable, reusable, reasonably accurate method of measuring time
Specifications Size :- HEIGHT :-21CM DIAMETER :- 8CM Color :- AS SHOW IN PHOTO Material :- Brass weight:-450
Features All Work is Hand Made
Payment Mode CASH, BANK TRANSFER
Package Details BOX PACKGING
Minimum Quantity 1 PCS
Production Capacity ACCORDING PRODUCT
Delivery Time 7-14 DAYS
Keywords sand timer