Indian Forester. December 1918

So much for the description of the functions of the mixing vat; the careful heating of the resin while slowly mixing ; a period of rest ; the separation of the mixture into two layers. [...] inch) pressure is then allowed to enter and the temperature gradually ascends to between i50' and 16cf and is kept from going further by gradually increasing the amount of injected steam for as the distillation proceeds the available quantity of turpentine dc reases and the separation of the rosin from the last part of the tupentine oil requires a considerable temperature. [...] The lower annular condensing pipe communicates with the separator for the discharge of the distillate by means of a goose-neck pipe the levels being so arranged that a short column of liquid prevents the entry of air into the condensing apparatus whether the still is working or at rest. [...] The air-valve on the dome of the still is for use during the drawing-off of the rosin. [...] 6 shows the filtering of the rosin in the rosin shed `and 'the filling of casks and bags with rosin while the despatch of the manufactured goods forms the subject of Plate 43 Fig.