I am reminded of the somewhat distorted figures that result from the use of
electronic beam 'people counters'.
We introduced such a device in a major art gallery a few years ago. This
unfortunately coincided with a period of interior reconstruction which meant
a steady stream of tradespeople.
The painter's with their ladders resulted in some 'excellent patronage
figures' on the days that the rungs of their ladders passed through the
beam!

This problem is also compounded if there is more than one entry or exit.
The only accurate method is by till receipt entry

Roger

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From: Peter Stevenson <[log in to unmask]>
Newsgroups: bit.listserv.museum-l
To: [log in to unmask] <[log in to unmask]>
Date: Wednesday, 23 December 1998 9:07
Subject: People Counters


>Does anyone out there no of an effective and hopefully cheap device for
>counting the number of visitors who enter an exhibit?
>
>Thanks in advance,
>
>Peter B. Stevenson
>Exhibit Developer
>Field Museum/Chicago
>[log in to unmask]
>
>"Make no little plans.  They have no magic to stir men's blood."
>                        `       Daniel Burnham, Architect of Chicago
>