I accidentally deleted the message from "Tom" asking about roof covers.
 
Go to Http://www.maths.abdn.ac.uk/~mel
 
You will see photos of what I believe that you are looking for. You can
then e-mail "Mel" about the details.
 
Regards,
 
Al
 
--
Al Needham * Scituate,MA,USA * [log in to unmask]
>"The HoneyBee"-An Educational Software Program V1.0<
      Available at: Http://www.kuai.se/~beeman/