A professional who tends vacuum cooker and open kettle to cook fruit and berries preparatory to making jams and jellies. Respnsibilities include:

• Observes thermometer, turns rheostat and steam valve, or pushes switch or lights burner to heat vacuum cooker and open kettle to specified temperature.
• Turns valve to transfer contents of kettle into vacuum cooker.
• Observes refractometer on vacuum cooker to determine sugar content and adds ingredients according to formula.
• Places container under discharge outlet of distillation jacket of cooker to reclaim esters.
• Opens valve or starts pump to transfer contents of vacuum cooker to holding tank or filling machine.