October 1992
Page 28

Sundial Line Drawing Jig

This article describes a Meccano jig designed by Noel Ta'Bois for drawing hour and declination lines on sundial plates of any shape, including curved surfaces. The instrument features a telescopic arm, set by calibrated dials for latitude, declination, and hour angle, which is extended to mark the shadow position of the nodus. It eliminates the need for complex calculations, making it useful for irregular surfaces.
Dialling Tools, Mathematics of Dialling, Sundial Design & Layout

Noel C. Ta'Bois

July 1991
Page 30

Corrections to Waugh's Sundials, Their Theory and Construction

This article provides specific corrections and clarifications for Albert E. Waugh's book 'Sundials, Their Theory and Construction.' It addresses errors in rules, footnotes, hour line diagrams (particularly for gnomon placement and shadow radiation), table values, and potential confusions in figure labelling, aiming to improve the accuracy and usability of the gnomonic text.
Book Reviews

Noel C. Ta'Bois