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Structura mecanismului
Funcţie This is a pyramid-shaped wooden box. A vertical rule is fixed to the upper part of one of the faces. At the base of this rule there is a rod with a cursor; it is possible to move the cursor along the rod. It is also possible to cause the rod to oscillate from right to left. The cursor position indicates the tempo. For transportation, to prevent the rod from moving, it is possible to block its upper end behind a small metal plate located above the rule. The plate has a notch in its centre to enable the rod end to be inserted. A wooden cover protects the graduated rule and the rod and cursor mechanism.
 

Aplicaţie
Exemple de aplicare This device produces an audible and visual signal to indicate a tempo. It was used by future teachers during their studies at the men’s and women’s teacher training colleges, now the IUFM (University Teacher Training Institute) in Clermont-Ferrand.
 
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DMG-Lib FaviconDMG-Lib https://www.dmg-lib.org/dmglib/handler?mcdsc=2905025
Europeana FaviconEuropeana  http://www.europeana.eu/portal/record/2020801/dmglib_handler_mcdsc_2905025.html
Data provider
IFMIFMA  http://www.ifma.fr
PtcPATSTEC  http://www.patstec.fr
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