From D. KEMPSON
I used this experiment many times, not with GCSE pupils, but with 11-year-olds.
It is a fiddly experiment, but one has to be patient. Our technician did
not set up the experiment, the pupils themselves did, with help as necessary.
I am sure that my procedure was that of many physics teachers, in that the
pupils saw the Brownian motion first, they were questioned carefully to
check that they had indeed seen it and only then would discussion of this
very important observation occur.
D. Kempson Stamford Lincolnshire
