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Nl 02

A photogram projector

A photogram is an image created by focusing light on a surface, such as film, which is treated with an emulsion. Standard photograms are taken on film with a silver nitrate emulsion. Another specially prepared emulsion allowed photograms to show Dust.[1]

History

Cittàgazze aurora

Cittàgazze seen in the aurora in a specially treated photogram.

When Lord Asriel was looking for funding for another expedition to the North, he used special photograms to show the Dust entering a man, and the city in the aurora to the scholars at Jordan College.[1]

Appearances

Notes and references

  1. 1.0 1.1 Northern Lights, Chapter 2

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