Re: Air resistance

[LUDWIK KOWALSKI <KOWALSKIL@alpha.montclair.edu>]

> Date: Thu, 11 Dec 1997 11:12:01 -0500
> From: John Gastineau <gastineau@mindspring.com>
> Subject: MBL, was Re: Air resistance

> Motion detectors often don't work well with air tracks. The air turbulence
> above the track interferes with the desired sound propagation. 

Is it conceivable that the probing waves are reflected from turbulances 
created by the folling ball (or filter) rather than from a solid surface?
This can explain our occasional "something was wrong" manifestations when 
the object was monitored from above? Perhaps monitoring from below, rather 
than from above, will help to eliminate sporadic bad data. The instruction 
manual should tell us about such things.
                                                   Ludwik Kowalski