September 2020
Page 21

Obituary: Gordon Ernest Taylor 1925–2020

An obituary for Gordon Ernest Taylor (no. 146), the BSS's first Registrar, renowned for his work in astronomy and lunar occultations. Highlights his gnomonic contributions, including a paper on reclining equiangular sundials (Foster-Lambert dial).
Dials: Foster-Lambert, Mathematics of Dialling, The BSS and Members

John Davis

September 2008
Page 123

An Analysis of the Vertical Equiangular Sundial

This paper provides a mathematical analysis of James Richard's rare vertical equiangular meantime sundial, designed to resemble a clock with equally spaced hours. It explains the gnomon's upward inclination and daily displacement, allowing for mean time and BST adjustments. The analysis, an alternative to Foster-Lambert theory, aims to stimulate interest in this unusual dial type.
Dials: Foster-Lambert, Dials: Vertical, Mathematics of Dialling, Sundial Design & Layout

Graham Aldred
Celia James

March 2007
Page 40

The self-setting property of dual sundials

This paper examines the self-setting property of dual sundials, typically consisting of a polar-gnomon dial and an analemmatic dial. It explains the astronomical parameters involved, how rotation affects time indications, and calculates the effectiveness of this alignment method at various latitudes and declinations. It also compares the traditional dual dial with an alternative Foster-Lambert reclining dial.
Dials: Foster-Lambert, Dials: Double Horizontal

Michael Lowne

October 1991
Page 24

A Self-Orienting Equiangular Sundial

Fred Sawyer presents a self-orienting equiangular sundial, a modification of the Foster-Lambert hybrid dial, capable of correct orientation without external devices. It functions as both a solar clock and a solar compass, determining true celestial north. The design involves a V-shaped gnomon and two sets of hour-markings, allowing for simultaneous readings of Standard and Apparent time and a straightforward orientation process.
Dials: Foster-Lambert, How Sundials Work, Sundial Design & Layout

Fred Sawyer