Two clamps secure the glass sphere into the position required to obtain an exact measure of sunshine; this position is based on the coordinates of the meteorological station.
lock nut
The nut of the leveling screw, which tightens to secure the base plate in a given position.
leveling screw
Screw making it possible to level the instrument along its two axes, north-south and east-west.
lower support screw
sunshine card
Strip of paper, calibrated in hours, that is burned by the Sun’s rays; it registers the duration of sunshine.
base plate
Stationary metal support in the form of a triangle; it is comprised of three coupling sleeves, each having a leveling screw.
check nut
sub-base
Adjustable metal support that makes it possible to level the instrument by means of leveling screws.
glass sphere
In the manner of a magnifying glass, it concentrates the Sun’s rays on the sunshine card.
