Twin Pivot Grasshopper Escapement - invented by John Harrison

Four minute escape wheel
No sliding friction, no wear, no lubrication
Entry angle = 90 degrees
Exit angle = 89.73 degrees

Thank you, David Heskin. More information refer to: www.hsn161.com

Тэги:

#escapement #Horology #間歇運動機構 #擒縱機構 #Grasshopper_Escapement

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