A photograph is an image made by exposing a negative to a surface that is sensitive to light. Usually made on paper, photographic images can also be made on any surface that can be coated with a light-sensitive material, including cloth, canvas, ivory, and tin.

1. Cyrus Field / Mathew Brady Studio

2. Ulysses S. Grant / Mathew Brady Studio

3. Julia Dent Grant / Mathew Brady Studio

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