June 2010 page 36
Heiner Thiessen

A Chime Dial

This article introduces the Chime Dial, an equatorial sundial inspired by historic noon cannons, designed to read solar time and provide an acoustic reminder of the sun's journey. It consists of two brass hemispheres and a dial face with five-minute intervals. A Light Dependent Resistor (LDR) inside the sphere triggers a chime when a sunray passes through a narrow gap, marking a pre-set time.
Construction Projects, DIY Sundial Projects, Dials: Equatorial, Sundial Design & Layout

March 2004 page 42
Heiner Thiessen

An Early Planisphere from the Hanse Town of Hamburg

This article introduces a historical etching of a planisphere, an abstract representation of the globe showing time differences across various geographical locations relative to Hamburg's meridian. The author discusses its potential dating, its explicit mention of "sacrilegious art" in relation to sundials, and the varying accuracy of its geographical entries, inviting further information.

September 2004 page 91
Heiner Thiessen

Vial Dial

Description and design of an equatorial ‘vial’ ring dial that combines a planisphere with a sundial. Uses a spirit-level alidade and a rotating outer ring to read local apparent time for any longitude, and to estimate sunrise, sunset and the locus of solar midnight across longitudes.
Dials: Equatorial, How Sundials Work, Sundial Design & Layout

June 2003 page 63
Heiner Thiessen

Celestial Ring Dial

A description of a portable celestial ring dial design. The article discusses the dial's functionality, its use of celestial bodies, and the construction details including the gnomon and other features.
Construction Projects, Sundial Design & Layout

December 2002 page 141
Heiner Thiessen

Sunrise Dial

Description of an interactive, educational sundial model representing Earth and showing local apparent time, sunrise/sunset, solar declination, and more.
DIY Sundial Projects, Dials: Equatorial, How Sundials Work