Stereo analysis
AnalyzedVerdict
Genuine stereo pair97%
The two photographs contain the viewpoint difference needed to produce genuine depth.
- Depth spread
- 6px
- The range of horizontal difference between the two views. More spread generally means more depth; 0–1 px usually indicates a monoview.
- Match
- 100%
- The share of usable picture detail that can be matched between the left and right views. A higher number means a more reliable comparison.
- Vertical
- 1px
- Vertical drift between matched details. Lower is better; 4 px or more can indicate camera movement, scan skew, or poor alignment.
A street-level stereoview of flood damage at Allegheny City. A man stands beside a wheelbarrow in the muddy roadway, with barrels prominent in the foreground. Beyond the curb, men and children gather around wooden buildings and scattered wreckage; another man stands on a low roof. A hillside rises behind the closely spaced structures.
The paired photographs are mounted on green card, captioned “View at Allegheny City. (over)” and headed “Pittsburgh and Allegheny Flood.” The mount identifies Knowlton Brothers of Northampton, Massachusetts; the reverse explicitly credits the firm with photographing and publishing the views.
The reverse places the card within “Views of the Three Floods,” encompassing the Mill River Valley, Middlefield, and Pittsburgh and Allegheny floods. Its account says the Allegheny set followed the flood’s course from Butchers’ Run through Madison Avenue, Concord and O’Hara Streets to Center and adjoining streets, where water from Spring Garden Run joined it. This describes the coverage of the set, not the precise location of this photograph.
The particular street and buildings remain unidentified, and no date is printed. Both photographs are intact, with clear reverse printing; the card is clean and sound overall.
- Title on card
- View at Allegheny City. (over)
- Medium
- Stereoview
- Subject
- Children, Occupational, Outdoor Scene
- Dimensions
- 6.96 × 3.48 in (176.7 × 88.3 mm)
- Condition
- Clean and sound overall, with both photographs intact and the printed reverse clear and legible; no major damage is visible.
- Catalogue no.
- MSV1824
Catalogue details
Location
Butchers' Run flood district, Allegheny City (Pittsburgh North Side) · Pittsburgh, Pennsylvania, United States
Photographed subject · Street / district · 60% confidence
Front: "View at Allegheny City." Reverse (Knowlton Bros., "Views of the Three Floods"): the Allegheny views were taken along the course of the flood from Butchers' Run, through Madison Avenue, Concord and O'Hara Streets to Center, and the streets where the Spring Garden Run flood joined it (1874 flood). Pin is in that run corridor; the exact street in this view is not named.
Source: Card front caption + reverse publisher text
