8.
The final mass spectrograph
In
1937 Aston built his final mass spectrograph. The slits
used to focus the beam of charged particles could now
be adjusted externally, the magnetic field was improved,
and a more sensitive photographic plate was developed
in collaboration with the Ilford photographic company.
The resolving power of the third mass spectrograph was
about twenty times greater than the first, and was about
a hundred times more accurate in determining the mass
of particles.
Aston's
third and final mass spectrograph displayed in the Cavendish
Laboratory museum, Cambridge
Aston's
first mass spectrograph was dismantled in 1925, but
is now on display at the Science Museum in London. His
third mass spectrograph is on display in the Museum
of the Cavendish Laboratory, Cambridge.
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