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James M. Vianna, PLS
Vermont Society of Land SurveyorsColchester, VermontSeptember 5, 2019
James M. Vianna, PLS,
James M. Vianna, PLS170 Lohnes RoadStillwater, N.Y. 12170(518)[email protected]
1. GEODETIC TRIANGLES2. STATIONS3. SIGNALS & TOWERS4. INSTRUMENTS5. BASELINES6. BOUNDARY LINES
WHY DOES VERPLANCK COLVIN’S WORK MATTER?
Chapter 589 of the Laws of 1895, Section 5
“All maps or field notes prepared and issued by the superintendent of the State Land Survey under his certificate, hand and official seal, shall be
accepted in the courts of this State as prima facie evidence of the particular boundaries and locations shown ---”
Chapter 661 of the Laws of 1900, Section 2
“All of Chapter 598 of the Laws of 1895 -- except Section 5 thereof ---are hereby repealed”
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James M. Vianna, PLS
Page 65
For his initial work in
1872 Colvinwas given an
“appropriation” of $1,000
Initial Triangles
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James M. Vianna, PLS
Stations (preliminary sketches)
Station details
Bolt 17 -- Mt. SkylightColvin “old style”
(Type One)
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James M. Vianna, PLS
Colvin “new style” (Type Two)Bolt 55 - Vanderwalker Mtn. and later USC&GS marker
“Type Three”
“Type Four”
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James M. Vianna, PLS
Signals & Towers
Isle La Motte, Vermont& Cumberland Revolving signal
Signals & Towers “Parallel Movement Heliotrope”
Signals & Towers
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James M. Vianna, PLS
Signals & Towers
Signals & Towers
1897 Report
Signals & Towers
Orson P. Morse 1890’s Polaris Mtn.
Orson P. Morse 2009 at Durants great camp Pine Knot on Raquette Lake
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James M. Vianna, PLS
Instruments
The 9” double vernier KernSuisse Aarau ?
The original ? “Grand Theodolite” as
manufactured by Oerthling of Berlin, outfitted with signaling heliotrope
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James M. Vianna, PLS
Typical Gurley instrument used on boundary line retracement by
the NYS Survey
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James M. Vianna, PLS
Baselines
(4,983.150’)4,983.250’ ±5mm + 5ppm
1 part in 50,000±
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James M. Vianna, PLS
Lake Placid
Boundary lines
Boundary lines “Dutton Mtn.”
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James M. Vianna, PLS
Boundary Maps
Essex County
Warren County
Crossing the Hudson RiverHarris 1844 View looking southerly or downstream
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James M. Vianna, PLS
Traverse station 26
County line in North River as per Colvin
Bolt26
Bolt28
Bolt27
SignalSta. 132
180° 00’ 10”
179° 59’ 30”
(1,777.78’ )1,777.18’
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James M. Vianna, PLS
“The Mapping of New York State: A Study in the History of Cartography”
David Yehling Allen
Colvin & Blake at the “Elms” Albany NY
Circa 1918Curtesy of
Denise CollinsworthHeir of Colvin's brother
