would that work on hollow objects? I thought displacement was more linked
to density. having a boat of many different materials and buoyed by air in
the hull and holds would surely affect the calculations somehow. but perhaps
it all evens out to get the weight.
----- Original Message -----
From: "Bea Hopkinson" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, January 15, 2004 8:52 PM
Subject: Re: Weighbridges
> Do you think this could be by displacement of water and doing the math?
> On 1/15/04 1:02 AM Martin Snow writes:
> >I recall seeing a weighbridge on/by a canal which actually weighed the
> >boat in the water, by some 'magical' (mechanical) system - gears and
> >levers no doubt!
> >Perhaps someone can remind me where this is and how it worked?
> >I recall that either 'arms' went out into the canal, or there was a water
> >chamber arrangement.
> >Quite early I think.
> >Martin Snow
> >> On 1/14/04 11:16 AM Rose, Edwin writes:
> >> >Does anyone know the earliest reference to/use of a weighbridge (as
> >> >for weighing carts/lorries) and the oldest one surviving?