OUT OF STOCK - £20.00
completely mesmerising, watch the wings spin when
placed in the light or sun. also known as a light mill
or solar engine, the solar radiometer was invented in
1873 by an english physicist. it demonstrates, with simple
physics and movement, how light can be transformed
into energy. when exposed to a warm light source, such
as the sun or a lamp, the black and polished vanes spin.
the black side of the vane absorbs the light faster than
the polished side, air pressure builds and raises the
temperature of the air molecules on the back side
of the vane causing the spinning motion.
the black used on the vanes can sometimes flake off.
these flakes are usually very small. this is not a defect,
but a result of the hand made nature of the product.
made in glass, beechwood and steel.
instructions in six languages
product 10 x 8 cm
box 16 x 12 cm
this is not a toy
one-minute magnetic sand clock. handsome glass timer on a beechwood stand. looks good on the shelf and creates mesmerising stalagmite formations. made of glass, powdered iron, magnet and beech. 16...
compact, light children's binoculars with a magnification factor of x 4. perfect for bird watching and for exploring. 10 x 10 x 4 cm age 3+
OUT OF STOCK - £3.50
miniature metal compass. perfect size for tucking into pockets and vital for little explorers. diameter 4.5 cm
OUT OF STOCK - £3.00
classic children's toy with a strong force because the north and south poles are close together. 5 x 4 cm