Main content
Miniature spy photography
How John Benjamin Dancer's pioneering experiments with microphotography helped the development of miniature spy photos which could be hidden in rings and pencil tops.
Duration:
This clip is from
More clips from The North West
![]()
Preview: Invented In the North West
Duration: 01:08
More clips from Invented in..
![]()
Sailing by 'breath control'—The South
Duration: 03:01
![]()
The 'rollercoaster ride' of invention—London
Duration: 02:48
![]()
The illuminated lollipop stick—The North East
Duration: 01:41
![]()
The aircraft cabin of the future—The North East
Duration: 01:32
