| Surveyor | Sowers, Thomas |
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| Former owner | Amherst, Jeffery Amherst, Baron, 1717-1797 |
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| Former owner | Royal United Services Institute for Defence and Security Studies |
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| Date | 1760 |
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| Scale | Scale approximately 1:4,800 |
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| Language | English |
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| Location | British Library |
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| Collection (local) | British Library Collection |
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| Subjects | - Fortification--New York (State)--Oswego--Maps, Manuscript--Early works to 1800
- Military art and science----New York (State)--Oswego--Maps, Manuscript--Early works to 1800
- Fort Ontario (N.Y.)--Maps, Manuscript--Early works to 1800
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| Places | - Fort Ontario
- North and Central America
- Oswego
- Oswego (county)
- United States
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| Extent | 1 map on 2 sheets : joined, manuscript pen and ink with watercolour ; 53 x 89 cm |
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| Terms and License | - No known copyright restrictions.
- This work is licensed for use under a Creative Commons Attribution Non-Commercial Share Alike License (CC BY-NC-SA).
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| Notes | - Relief shown by shading.
- Sounding depths are given.
- Shows title in a simple surround at lower centre incorporating scale bars, "Scale for the Gen.l Plan 400 feet to an Inch" and "Scale of Yards".
- Shows lettered key (A-W) at lower right identifying "Fort George demolished" and "Oswego Fort demolished" on the west bank of the Oswego River ("Onnondaga River"). These forts are identified differently to Add Ms 57,708.5.
- Inset at lower left with "FORT ONTARIO, Built by THOMAS SOWERS Engineer. 1760" (scale approxiamtely 1:4,800) and three sectional drawings through the fort (scale approximately 1:480).
- Copy at Add Ms 57,708.6. Bound in R.U.S.I. Vol LXXIII. Comprises 2 sheets, joined. Shows red stamp of R.U.S.I. at lower right. Shows manuscript addition of "6" in pencil at upper right. Laid on archival tissue. Green circular label to verso showing "32". White label to verso showing "DRAWER 30 SECTION 1". Manuscript annotation to verso shows "C 43". Blue label to verso showing "A 30/55". Paper watermark shows a diagonal stripe within a shield.
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