| 31. | In 1972, Mann came upon Miley's glass negatives at Washington and Lee University and has printed thousands of them.
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| 32. | Photographs This collection consists of about 3, 500 prints, glass negatives and carte-de-visit, plus 2, 190 lantern slides.
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| 33. | That same year, Henry Wellcome acquired a collection of glass negatives, totalling over 600, that were owned by Thomson.
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| 34. | Using glass negatives at this time, Leonard increased the sensitivity of the plates by exposing them to mercury vapor.
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| 35. | Pope was one of the first architectural students to master the use of the large-format camera, with glass negatives.
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| 36. | Among notable works in the archive are the Lunther Cody Collection of Glass Negatives, documenting classic life in New England.
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| 37. | For these images he often used glass negatives as these had short exposure times allowing a high level of detail.
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| 38. | The museum also houses the Paulus Collection of photograph glass negatives of the Salem area from the early Twentieth Century.
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| 39. | The glass negatives had to be developed in the darkroom at a later date and then printed as positive prints.
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| 40. | The musuem has the largest collection of Chansonetta prints in existence, many of her glass negatives, photo equipment and personal effects.
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