Put 20 g of the cleaned, air-dried, cut, aerial parts of rosemary into the round-bottom flask of Clevenger-type apparatus, add 100 ml pure water and boil for 4 hours.
The essential oil will be hydro-distilled and - when condensed - eliminate from water and swim on top.
Then you open the valve of apparatus, drain away the water properly and then collect the essential oil in a container, dissolve it ( in n-hexane f.e. ) and dry over anhydrous sodium sulphate.
Here you find a pic of the apparatus:
http://www.hemcmedical.com/equipments/45...
Sometimes you can measure the ml oil you gained, if the pipe between valve and cooler is graduated ( Hope I used the correct terms! )
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