In addition to the hourglass, there are more structurally similar water. Their simplified version can be made and most. Enough to take two graduated bottles for baby food and to connect them with their necks in one tube, which is inserted two thin tubes, so that their opposite ends do not reach the bottom of the bottle. Time can be tracked for graduation or to apply a special scale by looking at the clock.
Recommend to read
GARDEN “ROASTER”
Barbecue has long been the international (or interregional) Russian dish, spreading throughout the former Soviet Union and even beyond. Every connoisseur of this dish is your "brand" the...
CIRCULAR SAW IN A CASE
A circular electric saw is a very useful thing in any household. In terms of usefulness, it is probably in second place after an electric drill. About the design of the electric saw: it...
