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[OM] Rejoinder to vacuum cleaner thead of a few days ago

Subject: [OM] Rejoinder to vacuum cleaner thead of a few days ago
From: "Brian Swale" <bj@xxxxxxxxxxxxxxx>
Date: Sun, 4 Mar 2007 06:50:15 +1300
Hi,

Somebody suggested that a miniature vacuum cleaner could drag in and 
deposit more dust that it removes - when cleaning camera mirrors and 
screens, etc.

I don't believe this could be true. And by the way, if true, how is it that 
carpets are usually cleaner after being vacuumed than before?.

Think about it. The concentration of dust in incoming air is extremely low. 
Probably much lower than for the mirror etc being cleaned. Also, incoming 
dust has by this time attained a velocity equal to that of the air it's in and 
there's no way it will escape that air train and avoid being caught in the 
cleaner dust-bag. The moving air and its contents ultimately are all going one 
way. Away from the camera.

Brian

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