File #4747: "Solar pyrheliometer. A large instrument made of steel, brass and wood. Three small fan shaped steel plates which can be rotated are positioned over a long brass cylinder which extends from a squat wooden cylinder, suspended in a ring mount allowing the apparatus to be rotated in multiple directions."

Solar pyrheliometer. A large instrument made of steel, brass and wood. Three small fan shaped steel plates which can be rotated are positioned over a long brass cylinder which extends from a squat wooden cylinder, suspended in a ring mount allowing the apparatus to be rotated in multiple directions.

Title

Solar pyrheliometer. A large instrument made of steel, brass and wood. Three small fan shaped steel plates which can be rotated are positioned over a long brass cylinder which extends from a squat wooden cylinder, suspended in a ring mount allowing the apparatus to be rotated in multiple directions.