Amazing eBay find. Boat lightening device.

earlybird

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18 Aug 2004
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Cumbria; U.K.
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At risk of telling granny etc. it's for auto-switching between port & stbd. depth transducers on a deep hulled sailing boat when tackiing.
Not so useful for many modern hull shapes.
 

Dan Tribe

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3 Jun 2017
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An anti gravity device would be very handy when doing house alterations. Clients often ask for wall to be removed and glass doors installed on 2 or 3 sides of a room.
Pillars or columns? No, don't want to see any those.
 

Daydream believer

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Southminster, essex
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I had twin transducers & the switching device was basically an eg timer balanced horizontally. It had mercury that partially filled 1 bulb. When the boat tacked the mercury ran to the opposite bulb & the unit tipped & flipped the switch to the transducer on the correct side.
 
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