A photographic method of detecting changes in a complicated group of objects
Book details
- Title
- A photographic method of detecting changes in a complicated group of objects
- Publication year listed
- 1920
- Format
- Public domain eBook
- Reading access
- Free online reader; no registration required
- Source record
- View on Archive.org
About this book
A photographic method of detecting changes in a complicated group of objects
Year: 1920
Describes the application of photography to the detection of small changes in a complicated group of objects. A photograph is taken of the group before and after a change is suspected to have taken place. From the negative of one photograph a positive is made, and this is superposed on the other negative so as to bring them into register, and the combination is viewed against a source of light. If the photographs have been made on similar plates and from nearly the same position with similar conditions of lighting, those parts of the combination which correspond to the unchanged portion will appear as a field of practically uniform density, while a change in the group is shown up by a considerable departure from uniformity. Photographs ar
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