Iris photometer, Edinburgh Observatory

Iris photometer, Edinburgh Observatory

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Caption: Iris photometer. This instrument is used to measure the relative brightness of stars. An adjustable aperture (the iris) is adjusted around the star being measured until the light matches a reference value. This is seen on the screen at left. This is a digitised iris photometer, with the digital readings displayed on the machine at centre. Digital astronomical equipment was developed in the mid-20th century. This photometer is located at the Royal Observatory, Edinburgh, Scotland.

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