Domenico in Rieti near Rome Italy was not only raised from ruins recently, but it was furnished with an exceptional instrument. First, there are not many instruments which were dedicated to the pope and built under the vivid attention of the papal authority. The secretary of the Vatican state, cardinal Tarcisio Bertone was himself the honorary president of the committee for the construction of the instrument. Second, it is one of the finest instruments of Bartolomeo Formentelli, who built the organ in All the stops are in such great shape. This organ is "fast".
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As a recognized organ-builder, he was called upon to carry out repairs and appraise and advise other organ-builders in many locations across France. This monumental opus contains great historical detail about eighteenth-century organ building, and is still referred to by modern organ-builders. He is buried in the former Abbey now Basilica of Saint-Denis. Organ building in the mid 18th century The 26 images below are taken from this work, kept in the St.
It relies on a theorem proved on by P. Starting at the bottom of the paper, a line is drawn across, and a vertical one up the centre. Where they cross is the point O. Choose the size of the dial, and draw a line across. Where it crosses the centre line is F Using the selected latitude. Using a square, a line is dropped from F through the construction line so they cross at right angles. That point E is important. Using compasses, or dividers the length FE is copied upwards in the centre line from F.
The new point is called G and yes it is important- the construction lines and FE may now be erased. The centre of the dial is at the bottom, point O. The line drawn from each of these hour point to O will be the hour line on the finished dial. Call the point where 3 crosses the line R, and a drop a line at right-angles to the base line. Call that point W. Use a construction line to join W and F.
Waugh, in his book, calls the crossing points with the hours lines K, L, M. The missing hour lines are drawn from O through N and through P. The construction lines are erased. The P. The method became well-known when it was adopted by Waugh, as the construction method to be used for horizontal dials by Albert Waugh, in his book Sundials: their theory and construction.
Bibliography Sawyer. Horizontal Layouts 1—4. North American Sundial Society.
L'art du facteur d'orgues (Bédos de Celles de Salelles, François Lamathe)
Dom Bedos de Celles