TM235 CHARPY IMPACT TESTING MACHINE, 150/300 J

The impact testing machine is for determination of resistance to fracture of materials by Charpy test based on DIN50115 and DIN51222.
The machine is constructed with a heavy base and single support column. The pendulum is hung on ball bearings. Manual lifting of hammer is by two stage reduction gear. Hammer weight can be reduced for lower capacity with smaller graduation. A pendulum mechanical brake and safety guard are also provided.
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[@hitts8928]

can someone explains to me how the manual lifting mechanism works ?