bodmas.org

1600 watts

Filed in Maths on April 5th 06 .

35 mm motion picture film still

Some enterprising Media Diploma studies students interviewed the owner of the oldest cinema in England [ 5 minutes, 67Mb, mpg, excellent sound ] – The Electric Cinema in Birmingham.

One throw-away comment as the proud proprietor was demonstrating his projection room: 1600 watts of light – each 1/24th of a second, a 35mm movie film frame gets 1.6 Kw of light passed through it, I guess in four blasts as most film projectors use a ‘maltese cross’ arrangement to chop the 1/24th of a second into 1/96th of a second to reduce flicker.

A movie film frame sits horizontally across the film (18mm by 24mm) so that is something like 3.7 watts per square millimetre of film stock, or around 154 milli-Joules of light energy for each square millimetre of film. Serious heat – no wonder they need infra-red filters.

russian movie camera takes 35mm film stock

This is filed under Maths. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are closed for this post.

[ bodmas home ]

Subscribe to bodmas.org using RSS

offline blogging tool ecto in use on bodmas

Site delivered by WordPress

Entries and comments feeds.

© Content Keith Burnett, 2006. This old school table-based layout was devised to support a Web authoring module. Mind you, it loads quicker than Kubrick in Safari...