PM-522 SUNSHINE RECORDER

A round bottom flask is used as a sphere. Sunrays are focussed by
the glass globe of the sunshine recorder, which charr a piece of
paper dial. From the length of the charred portion the hours of
sunshine can be calculated. Apparatus consist of round base with
levelling screws and central rod with a plated tommy bar and arc
shaped plate which can be adjusted by tommy bar to set the flask
globe at required latitude. Supplied with 12 spare printed dials.