skip to main content


David Usborne



Catalogue link

View catalogue record


Creative Commons

What can I do with this work?

  • Can I download it?
  • Can I remix or adapt it?
  • Can I share it?
  • Can I make money from it?
  • Must I acknowledge the creator with a credit in my work?
Creative Commons License:

Placed on the centreline of a lead pipe this allows a plumber to trace the line of intersection with another pipe by scribing an an elliptical arc using dividers one point of which was placed in one of the central row of holes.

Related objects