Solar Radiometer RD3
Hanging Solar Radiometer RD4 click
for RD4
Available for UK
delivery only |
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Memories of school days may include a radiometer in the science lab.
If not, you will see that the paddles inside this fascinating device spin
under the power of the sun - fast when it's bright and slow when it's
dull.
It serves absolutely no useful
purpose whatsoever, except as an elegant object that it is a fascinating talking point with
friends and visitors.
Dimensions: 198mm high; Ball diameter 80mm
| Price: RD3 |
£23.50 |
|
£29.00 inc packing &
carriage by Royal Mail Special Delivery service* |
|
|
|
| * Carriage paid to; England,
Wales, Scotland (incl. Highlands & Islands), N. Ireland, Isle of Man & the
Isles of Scilly. Please enquire for elsewhere. |
|
How
does it work? |
|
Hanging Solar Radiometer RD4 Available for UK
delivery only |
|
|
A larger, hanging version of RD3 (cord
not supplied).
A glass hook at the bottom of ball lets
you hang another ball below.
| Dimensions: |
Diameter: 110mm (4.33") |
|
Length: 180mm (7.1") |
| Price: RD4 |
£23.50 |
|
£29.00 inc packing &
carriage by Royal Mail Special Delivery service* |
|
|
|
|
|
* Carriage paid to; England,
Wales, Scotland (incl. Highlands & Islands), N. Ireland, Isle of Man & the
Isles of Scilly. Please enquire for elsewhere. |
How do they
work?
Even the scientists don't fully
agree, but it's down to something like this.....
The four "paddles" are black on one side and silver on the
other. The black side absorbs more
energy from the sun than the silver side. The latest theory says
that it is the effect of molecular movement around the edges of the
paddles. This generates sufficient force to turn the paddles.
However, this can only happen when there is a partial vacuum within the
ball. As the forces involved are tiny, a normal atmosphere in the
ball would create too much resistance to the paddles rotating. |
Back
to RD3 |
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