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Trebuchet

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Structure of mechanism

Function This instrument comprises a horizontal beam, which oscillates on a knife-edge which is in fact a steel prism. This knife-edge is part of the beam. At each extremity of the beam is another knife-edge (facing upwards) on which is suspended a staple supporting two pans. On each pan there is an initial, either D or G, to indicate whether it is the right-hand (D) or left-hand (G) pan, to optimise balancing. Two nuts on threaded shafts enable the balance adjustment of the mobile parts. A very long needle fixed to the middle of the beam, facing downwards, moves in front of a graduated scale to facilitate the monitoring of the equilibrium. On the front of the apparatus is a lock whose key is used to raise or lower the beam with respect to the knife-edge fulcrum. This avoids unnecessary wear when the scale is not in use.
A drawer located underneath the device is used for storing the accessories (weights, pincers, etc.), as well as the dismantled scale.
 

Application

Examples of application The device enables precise weight measurement. 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.
 
Permanent links
DMG-Lib FaviconDMG-Lib https://www.dmg-lib.org/dmglib/handler?mcdsc=2893025
Europeana FaviconEuropeana  http://www.europeana.eu/portal/record/2020801/dmglib_handler_mcdsc_2893025.html
Data provider
IFMIFMA  http://www.ifma.fr
PtcPATSTEC  http://www.patstec.fr
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