水表

carolfeeling

www2.tvboxnow.com& h# @$ M; d$ P4 z: i3 i
tvb now,tvbnow,bttvb7 n  h% s0 c8 D4 D) ~$ s
这个水表可不是测量用水量的仪表，而是用水“驱动”的钟表。
5 P' B% l! j5 c8 ~4 I你只要按照说明向里面加入一些盐水即可驱动手表运转，而避免了使用电池带来的污染。

limsp5

I remember a Korean who had invented a electricity generator using urine. I am sure it will work with brine.

chea76

can save buying battery or using elect.  but actually clock doesn't use much of battery... normally can already last for year or 2...

shenngau

good idea...