Titles read: '"Locks, bolts, and - - " other things of other days. Filmed with the co-operation of the Science Museum, South Kensington.'
Several shots of an early safe, showing the intricate locking mechanism inside, and a huge modern safe being opened.
We see Hook's microscope (very early model) and a modern day version. Then a counting machine invented 300 years ago and the present day adding machine. A typewriter of 1856 is contrasted with a modern machine. Someone is seen typing at great speed (looks like it is speeded up footage and is quite grainy and dark).