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Astroclock LINKS. LINKS (Newest links in yellow) Astronomical Clocks/ Planetariums: Eise Eisinga Planetarium Planetarium Zuylenburgh Festo Harmonices Mundi Giovanni de Dondi Astrarium Prague Astronomical clock Andreas Nilsson - The Astronomical Clocks of Rasmus Sørnes Astronomische Uhr Ulm - (German) Henk Olthof - Achterhoeks Planetarium (Dutch) Sean Gallagher - Negative Space The Astronomical Clock of the St Marien Kirche in Rostock The Prague Astronomical Clock - Orloj The Astronomical Clock of Beçanson The Long Now Foundation The Restoration of Jens Olsen's clock The Richard Wallingford Clock The Türler Clock Werner Anderegg - Astronomische Uhren (German) Wier - An Astronomical Clock Wikipedia - Astronomical Clock Wildrik Botjes Planetarium Willy Leenders - Prague five kinds of time on one clock Antikythera Mechanism - (Re-Design of): Bob Warfield - CNC Cookbook The Antikythera Artifact The Antikythera Computing Device The Antikythera Mechanism 1 - with animations by Bill Casselman Jerry Julliano - The Antikythera Mechanism J.

Eric Freitas- Welcome - Planetarium Friesland. World's Most Visited Watch Forum Site. HYT H2 Hydro Mechanical Watch. Watch Anatomy | Tourneau. Case: Consisting of a watch's middle, bezel, and back, it protects and houses the movement inside. It can be made from different metals and in different shapes. The examples below illustrate common case shapes currently being produced. Crystal: The Crystal is a 'glass' covering the dial or 'face' of the watch, protecting it from dirt and water. There are three major types of crystals produced and used in watch making. Synthetic Sapphire: This transparent, lab grown element has exactly the same chemical composition as natural sapphire. Mineral: Mineral crystals are made of glass. Acrylic: Acrylic is the most affordable type of crystal. Mohs Scale of Hardness: A scientific scale which measures the relative hardness of minerals.

Dial: The dial is the face of the watch. Subdial: A small dial set within the main dial, used to display an additional complication such as Chronograph readout, seconds, or date. Hour Marker: An hour indicator applied or painted on the dial of the watch. Mechanical Watch Movements. Rolling Ball Clock. CNC Cookbook: Astronomical Clock. Notes on Constructing an Orrery / Antikythera Mechanism I've always had a great interest in Astronomy, and I read with great interest recent articles about the Antikythera Mechanism, which was apparently an ancient orrery or simulator of motions of the heavenly bodies. The machine, which was constructed circa 80 BC, could represent the motions of most heavenly bodies known in its time using a clockwork consisting of 37 gears. Differential Gear Mechanism Was Way Ahead of Its Time... The front dial would show the progression of the Sun and Moon through the Zodiac according to the ancient Egyptian calendar. The lower back dial gives the Metonic cycle, the Synodic cycle, and the Lunar year of 12 Synodic months.

Later researchers determined that the device could show the motion of the visible planets through the Zodiac, as well as predict Solar and Lunar eclipses using the Saros scale. It also displayed the Calippic scale. Front and Back of a Reconstructed Model of the Antykthera Mechanism. Cogworks. Gearless Clock. * * Last Modified: 04 April 2014 04:58 MST Click to Enlarge After reading Dr. Philip Woodward's "My Own Right Time", I was inspired to build a copy of his gearless clock. John Wilding's construction book for this clock provides details that simplify construction although (as usual) I made some "improvements". The minimal number of parts and their unusual construction made this a delightful project, enhanced by the fact that this clock obviously wanted to run.

The picture above (left, with yellow string replacing the stylish pink drive string) was taken during a trial of the weight/drive system. The temporary dial is paper, just taped in place for evaluation. Overview Dr. The pendulum in this clock connects directly to a ratchet wheel via a pawl which indexes this count wheel for each swing of the pendulum; a backstop pawl ensures the wheel indexes in the correct direction at each swing. Pendulum Temperature Compensation - An Obvious Problem with No Obvious Solution. Clock Parts Terminology. Gary's wooden clocks. The Astrarium. His "Tractatus Astrarii" is preserved in the Capitular of Padua. It is written in medieval Latin and is completed with sketches showing such an accuracy and clarity to be comparable to those of modern engineering. Units of measurement in XIVth century were limited to the needs of the daily life , that is the length of a piece of cloth or the distance between the Abbey and the Prince's Palace - and therefore not suitable to give the measure of those small pieces fitted in the astrarium.

Giovanni solved this problem using reference units such as "the thickness of the blade of a big knife", or "the thickness of the blade of a small knife," or in the case of holes, "like that of a goose feather", or " hen feather" and so on. SeeSaw Gravity Escapement. Summary This article describes a novel clock escapement, termed The SeeSaw Gravity Escapement1,2, in which, paradoxically, the pendulum controls the escapement, but the pendulum is 'unaware that the escapement exists'. A proof-of-concept model is described which demonstrates the feasibility of the escapement3. In addition, two alternative modes of impulse are described. Background The escapement has three important functions: 1. Pendulum. 2. 3. Aforementioned tasks. Furthermore: In an ideal escapement, the pendulum controls the escapement, but, paradoxically, the pendulum should be 'unaware that the escapement exists'.

Many different types of escapement have been described. More specifically, and without describing a myriad of escapements, sources of frictional and other errors include: 1. And clock hands. 5. Snow, acting on the hands. Gravity-type escapements largely obviate variation in pendular impulse caused by 3 – 5 above. Basic Ideas Energy interchange Impulse and reset The prop Concept Model. 42 escapement. Astroclock LINKS. 18th century. The Wandering Hour display (also known as a Floating Hour or Chronoscope) has been around four centuries. In 1656 the Campanus brothers had built a night clock for Pope Alexander XII. In a total innovation, they replaced the then conventional hands with hour figures on rotating discs, which performed a semicircular arc across the clock face.

The correct figure appeared at the start of each new hour. It then moved clockwise across the arc of the dial and, depending on its progress, simultaneously marked the quarter or half-hour, which had just passed. Alexander's night pendulum clock was illuminated by an oil lamp so that the pope could see the time in the dark. The concept is that the moving hour display keeps an almost metaphorical count of the passing minutes rising and setting along the hourly arc. Campani Brothers Tabernacle Night ClockLate 17th Century --> Link Below are samples of Wandering Hour watches over the past four centuries.

A variation was the 'Sun and Moon' dial. Wooden Clock Sculptures created by James Borden. Wooden clock plans and complete kits for scrollsaw and CNC.