Report for Duluth North Pier (Minnesota) - 1910

General
District: 11th
Inspector: Oliver G. Brown
Location: On the outer end of the N pier, at the entrance to Duluth Harbor, Minnesota, W'ly end of lake
Date of Report: 09/08/1910
Latitude: 46° 46' 55"
Longitude: 92° 05' 21"
Premises
Site: Permission of War Department
Date of Reservation:
Date of Deed:
Date of Permission:
Date of Lease:
Area of the Entire Site:
Area Inclosed:
Character of Soil:
Distance of tower from Nearest High-Water Mark:
Inclosures to Premises / Type of Fence:
Wharf or Landing on Premises:
Road to Land or Wharf Chararacter of and Distance:
Means to Reach Light Station:
Distance to Nearest Road:
Distance to Post Office:
Distance to Village:
Facilities for Public Conveyance:
Facilities for Private Conveyance:
Means Used for Support of Lantern: Tower
Number of Separate Lights: One
First Built or Established: 1909
Last Rebuilt, Repaired, or Renovated:
Condition at This Date: Excellent
Shape of Tower in Plan: Circular
Form of Tower: Conical
Height from Base to Ventilator Ball: 37'
Height of Focal Plane Above Mean High Water: 69'
Background of Lighthouse as Seen from Sea:
Color of Tower: White
Color of Tower/ How Produced: Paint
Tower Connection: Tower is on outer end of N pier
Object of Navigation: Guide to entrance to Duluth Harbor
Building Materials: Latticed steel columns covered with 5/16" steel shell
General Description:
Wall Thickness at Base: 5/16"
Wall Thickness at Parapet: 5/16"
Diameter at Base: 10' 6"
Diameter at Parapet: 8'
Kind of Stairway and Steps: Circ. cast iron stairs with pipe wall.
Number of Landings: 1 landing at watch room floor
Size of Glass: 12" x 18"
Number of Windows and Size of Sash: 5 windows of 1 sash - 16" x 23" sash.
Number of Doors: Iron door leads into tower at base
Kind of Foundation and Depth Below Surface: Sets on concrete pier
Character of Soil Surrounding the Lighthouse:
Soil Susceptibility:
Miscellaneous Remarks: White conical steel tower with octagonal black lantern
Lantern and Fixtures
Order of Lantern: 4th
Shape of Lantern: Polygonal
Diameter to Glass: 7' 1/2"
Diameter in the Clear:
Number of Sides: 8
Type of Bars: Vertical
Thickness of Bars:
Height Glazed: 3'
Number of Plates in Height: One
Number of Plates Each Side: One
Thickness of Plates: 1/4"
Size of Plates: 34" x 36"
Number of Storm Panes: None
Unglazed Side of Lantern: All sides glazed
What Bearings:
Construction Material Lantern: Lower part cast iron lined inside with steel plates; upper part wrought iron.
Construction Material Roof / Cowl: Cast iron pyramidal roof lined inside with sheet zinc.
Ventilator / Cowl: Cast iron
Lightning Spindle: Copper with platinum tip.
Description of Lightning Rod: 1-1/2" x 1/8" copper strip is attached to foot of latticed column, runs under base of tower, down man hole & into well under pier.
Balustrade: 3 rails, 2" x 1/2" iron. Lower 2 fitted with vertical spindles; vert. stanchions 1-3/4" diam. with ball top - gallery floor is cast iron & circular in plan.
Lantern Doors: 2-fold iron door leads from lower part of lantern to outside balcony.
Floor of Lantern: Cast iron
Watchroom Doors: Iron trap door leads down to watch room.
Parapet Diameter: 6' 3-3/4"
Ventilators
Location / Number: 4 ventilators in parapet
Ladders / Cleaning Arrangement: None
Curtain Hooks / Hanger: Hooks screwed into upper parts of vertical bars.


Watchroom
How is Watchroom Fitted: Directly under lantern, equipped with 3 windows of 1 sash each 16" x 23". Also contains cupboard for storing rags &c. Iron stairs lead from here up to lantern.
How is Relief Called: None
Where is Call System Led:
Illuminating Apparatus
Kind of Apparatus: Flashes produced by electricity
Intensity in Candles:
Name of Maker: Henry LePaute, Paris
Year Made: 1882
Marks and Number: HI/320
Order of Apparatus: 5th
Inside Diameter: 14 3/4"
Light Characteristic: White flash every 2 secs. eclipse 2 sec.
Time of Revolution: Not moveable
Flash Interval: 2 sec.
Duration of Flash: 2 sec.
Arc of Each Fixed Part: 4 fixed panels of 90 degrees each
Number of Panels: 4
Number of Flash Panels: None
Arc of Each:
Number of Elements in Central Drum: 5
Number of Prisms Above Center Drum: 6
Number of Prisms Below Center Drum: 3
Does Apparatus Revolve?: False
Is There a Revolving Belt?: False
Revolving Panels:
How Flash is Produced:
Number of Vertical Elements Panel:
Fixed Lens Covered:
Pedestal: Regulation 5th order cast iron
Service Table: None
Draft Tube Description:
Revolving Machinery: Not revolving
Standby and Description:
Chariot Float or Balls:
Chariot Description:
Length of Drop Tube: Russia iron 12" diam. & runs down full length of tower
Clock Weight:
Length of Winding Time: Flashes produced by electricity
Drive During Rewind:
Machinery Protection: Clock machinery sets on wooden shelf in watchroom.
Regulated: Motor connected with city electric lighting system drives clockwork that produces flashes & eclipse.
Lens Protection:
How Color is Produced:
Red Sectors Description:
Where Color Attached:
Form of Colored Glass:
Lamp Description: 50 cp incandescent light
Type of Illuminant:
Number of Spare Lamps:
Number of Spare Burners:
Candle Power:
Closets and Store Rooms
Tower Closet Use: Wooden cupboard fitted with shelves sets on concrete floor at base of tower, used to store auxiliary lamps.
Oil House Description:
Oil House Inside Dimension:
Oil House Construction Material:
Oil House Capacity:
Other (Describe):
Suitability:
Miscellaneous
Access to Lighthouse:
Distance and Direction:
Miscellaneous Remarks: Lamp used is 50 cp incandescent light & is fed from the city electric lighting system. Current is carried thro a wire cable laid underneath the pier & thence up into the lens.