Zinc and copper annodes are hooked to positive and negative terminals of a small electronic clock. A fruit or vegetable is pierced by the annodes and the acid inside serves as battery acid. Think phosporic acid (potato) citric acid (lemon), the acid in tomatoes and etc. Cool, especially if you don't tell the kiddos about the physics and hook up a candy bar to show how the clock doesn't run - must be a bad food with no energy.
Here's a picture - http://www.kidsgardeningstore.com/22-1053.html
Originally Posted by lisa tberry
okay, I gotta know what is a potato clock?
For me it's SUNGLASSES, and my highlighter to map my daily activities.
Amadeus:09Diamond;Celebrity:10Summit; HAL:87Rotterdam V,89Nieuw Amsterdam II,93Nordam III,94Ryndam III,96Westerdam III,99Veendam IV,01Maasdam V,02Amsterdam III,03Volendam III,03Zuiderdam II,04Westerdam IV,04Oosterdam I,05Zaandam III,06Statendam V,06Prinsendam II,07Nordam IV,08Eurodam I,08Rotterdam VI,09Veendam IV,09Volendam,10Nieuw Amsterdam IV,12Ryndam III,13Ryndam III, 14Volendam IV,14Eurodam;P&O:11Artemis;RC:07Splendour of the Seas,11Navigator of the Seas,12Majesty of the Seas;CDF:14Horizon