I refer to your article on the storage of nitrate film (NCE 31 May). Readers may be interested in the videos section of the website www. filmtech. com, where you can see a short video of nitrate film burning underwater and in a cinder block.
Also look at 'Interlock 101'.
Have you ever wondered how in the cinema they sometimes run the same film at the same time in two different screens - this is called interlocking - two or more projectors showing the same print.
This video takes it to the extreme and shows a 16 screen interlock. If you have the web connection to handle it, this video is well worth a look.
Phil Holbourn, year two civil engineering student, Coventry University pfh2@coventry. ac. uk