June 2006
Page 75

Turnstyle Dial

This article describes the design and construction of a horizontal sundial with a cylindrical gnomon, which the author calls a "Turnstile Dial." It explains how the shadow is cast from a continuum of tangent points on the rounded gnomon, the practical aspects of its construction using copper, and the plotting of hour lines tangential to a central ellipse.
Construction Projects, DIY Sundial Projects, Dials: Horizontal, Sundial Design & Layout

Len Burge

September 2003
Page 104

Morvah Church Dial: A Closer Look

This article re-examines the Morvah church sundial in Cornwall. The author finds that the dial was incorrectly laid out, possibly because the latitude was used where the co-latitude was needed in the design. He expresses alarm that this might be a common issue with Cornish church sundials.
Dials: Vertical, Mathematics of Dialling, Sundial Design & Layout

Len Burge

December 2002
Page 168

The Crowan Dial: First Impressions

Observations on an unusual slate dial-plate from Crowan, Cornwall, including physical description and preliminary thoughts on its age and type.
Dials: Equatorial, Historical Dials

Len Burge