Sundials - World's Oldest Clocks

North American Sundial Society


Sundial 51
State/Province:  Maryland Country:  USA
Dial Type:  Compound Polar Condition:   Excellent
Latitude:   39° 08' 41" N Longitude:   77° 13' 27' W
  • National Institute of Standards & Technology. Inner courtyard
  • Briggs Commemorative Sundial. One of the more complex and elaborate ones in the US. The dial plate lies parallel to the earth's axis of rotation. The dial has three gnomons. The upper and lower point out Eastern Standard time, the middle one indicates local apparent (solar) time throughout the year. A copy of the brochure is in the NASS Archives.
General Information:
  • Owner: NIST
  • Designer: R. N. Mayall
  • Builder:
  • Construction Date: 1948, August 13
  • Mayall, photo p.110, description, p.232-33.
    Commemorative Sundial brochure published by NIST.
Attachments Available:

Last Revised: 6/27/2013 16:12