Customer Reviews
4 Item(s)
- Don't waste your money Review by Dr. Terrence Maher
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Price Value Quality This beautifully manufactured device is completely dysfunctional. Air bubbles trapped in the water column cause the sand timer to float to the top immediately after rotation. This completely destroys the discrepant event effect. I suspect that dissolved air in the water dissipates after the glass column is sealed forming the unwanted air bubbles in the column. If this problem could be fixed, this device would be a nice addition in any science classroom or home office. Until this problem is remedied, I urge anyone considering buying this device to hold off.
(Posted on 6/7/11)
- Bad Manufacturing Review by Jim
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Quality Value Price I guess what is supposed to happen is the hour glass should rise up the glass cylinder as the sand falls to the bottom, however the air in the cylinder lifts it quickly to the top. The first one came shattered, the second one, filled with air. Also, the hour glass doesn't seem to work properly- the grains are too coarse and get clogged in the neck.
(Posted on 1/24/09)
- Doesn't work Review by Lowell Rasmussen
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Quality Value Price The performance does not match the description in the catalogue. When inverted the air in the liquid filled cylinger acts like a lifting cushion on the hourglass. The hourglass is rapidly pushed to the top. The sand will fall to the bottom of the hourglass but then nothing else happens. Not a large mystery as to why it rises. I believe it is poor manufacturing to have so much air included in the cylinder.
(Posted on 1/1/08)
- Missed the Point Review by James G. Gasper
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Quality Value Price This item is quite pretty, but whoever manufactured it completely missed the point. The original curiosity was somewhat confounding: When you see the item at first: the hour-glass is at the top of the enclosed cylinder, with all of its sand at the bottom of the hour glass. When you invert the device, the hour-glass stays at the bottom for a while, while the sand transfers to the bottom. At some point, the hour glass begins to rise to the top of the cylinder. Why? This one does not function like this.
(Posted on 5/23/07)
4 Item(s)
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