Walking in the Footsteps Of the Colonial Surveyor Milton Denny, PLS Denny Enterprise, LLC P O Box 70784 Tuscaloosa, Alabama 25407 205 507 0552 phone 205 799 7980 cell
[email protected] Copyright Jan. 2009 © Egyptian Surveyors Ogilby Map 1675 Early Measurement Systems Gunter Chain Wing Chain Engineer Chain 1 link = 7.92 inches 1 link = 9.90 inches 1 link = 1 foot 10 links = 7.92 feet 25 links = 16.50 feet 20 links = 16.5 feet 25 links = 25 feet 50 links = 33.0 feet 40 links = 33.0 feet 50 links = 50 feet 100 links = 66.0 feet 80 links = 66.0 feet 100 links = 100 feet Development of the English Mile 3 Barleycorns (layed lengthwise) = 1 Inch 12 Inches = 1 Foot 3 Feet = 1 Yard 9 Inches = 1 Span 5 Spans = 1 Ell 5 Feet = 1 Pace 125 Paces = 1 Furlong (660 feet) 5 ½ Yards = 1 Rod (16.5 feet) 40 Rods = 1 Furlong (660 feet) 8 Furlongs = 1 English Mile (5280 feet) 12 Furlongs = 1 League (7920 feet) 1 Minute of Latitude at Sea Level = 1 Nautical Mile (6,076.10 feet) English Surveyor Early Accuracy Standards English Accuracy Standards: Compass – nearest degree Survey chain – nearest pole/perch/rod 19th Century Standards: Compass – nearest ½ degree Survey chain – nearest ½ pole/perch/rod 1950 Standards: Transit – nearest 30 seconds Steel Tape – Tenth of a foot/temperature correction Laying Out the City of Baltimore 1730 Eighteenth Century Chain Wing / PennsylvaniaWing/Pennsylvania Chain – 80 Links per 66 Feet Role of the Surveyor in Colonial America ►Determine Boundaries ►Lay Out Towns ►Survey Farm Land ►Report Settler & Indian Movements ►Write Deeds