DISQUS

Granite Geek: Of triangles, circular manhole covers, and Reuleaux polygons

  • Adam · 2 years ago
    Dave, a very interesting story! I hadn't heard of this before. Thanks.
  • Adam · 2 years ago
    I forgot to ask, any pictures of the triangular manhole covers available?
  • Dave Brooks · 2 years ago
    The Telegraph doesn't include photos with its archived stories, alas. There was a picture in the paper. But I found a site that has an old story of mine about the subject, with a photo:
    http://images.google.com/imgres?imgurl=http://w...
  • gene porter · 2 years ago
    Old Nashua triangular manhole cover (s?) being auctioned this Saturday at Nashua Historical Soc; at/near Abbot House