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The main problem with a trackball is that they are  very accessible to 
people who are blind.
Lynn Baum
Jan Crocker LLC

Cory Stahl wrote:
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
> *****************************************************************************
>
> >From our experience there has been very little that could compare to the
> durability of the Happ trackballs, we use them in several places
> throughout the museum (we also use USB interface and pushbutton
> interfaces on them). 
>
> I can't remember the last time I had to replace one...we've had issues
> with Happ joysticks from time to time, but not the trackballs.
>
> Good luck!
>
> Cory Stahl
> A/V & Exhibit Maintenance Lead
> Science City @ Union Station
> Kansas City, MO
>
>
> -----Original Message-----
> From: Informal Science Education Network
> [mailto:[log in to unmask]] On Behalf Of Jeff Courtman
> Sent: Thursday, September 17, 2009 9:45 AM
> To: [log in to unmask]
> Subject: Happ Trackball - alternatives
>
> ISEN-ASTC-L is a service of the Association of Science-Technology
> Centers
> Incorporated, a worldwide network of science museums and related
> institutions.
> ************************************************************************
> *****
>
> We have a sub-contractor who claims to have had numerous problems  
> with Happ Trackballs being troublesome (bearings not engaging  
> smoothly); I've had the opposite experience.  Nevertheless, since he  
> is responsible for the interface, I'm wondering if a) you've had  
> mechanical issues with the Happ controller, other than routine  
> cleaning and b)if you've used other panel mount trackballs with  
> success that I can direct him towards.
>
> We're using a Mac in this case, so it needs to be USB compatible, and  
> it needs to have at least one pushbutton, or pushbutton interface.
>
> Thanks....
>
> 	
>
>
>
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>
> Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.
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