Report for Seven-foot Knoll (Maryland) - 1909

District: 5th
Inspector: Major W. E. Craighill, Light-House Engineer
Location: Seven-Foot Knoll, Md., off the mouth of Patapsco River, about 1/4 mile NE'ly from Cutoff Channel, and about midway of its length.
Date of Report: 05/05/1909
Latitude: 39° 09' 19"
Longitude: 76° 24' 33"
Site: Submarine
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: Boat
Distance to Nearest Road: 6 miles, to railroad station
Distance to Post Office: 6 miles
Distance to Village: 6 miles
Facilities for Public Conveyance: None
Facilities for Private Conveyance: Small boat, 6 miles
Means Used for Support of Lantern: Dwelling
Number of Separate Lights: 1
First Built or Established: 1855
Last Rebuilt, Repaired, or Renovated:
Condition at This Date: Good
Shape of Tower in Plan: Screwpile, Substructure, octagonal; superstructure, circular.
Form of Tower: Cylindrical
Height from Base to Ventilator Ball:
Height of Focal Plane Above Mean High Water: 42 feet
Background of Lighthouse as Seen from Sea: Woods
Color of Tower: Brown
Color of Tower/ How Produced: Paint
Tower Connection:
Object of Navigation: Bay, general
Building Materials:
General Description:
Wall Thickness at Base:
Wall Thickness at Parapet:
Diameter at Base: 40 feet
Diameter at Parapet: 12 feet
Kind of Stairway and Steps: Wood
Number of Landings: 1
Size of Glass: 10" x 15"
Number of Windows and Size of Sash: 6 - 2' 4" x 3' 4" & 5' 10" x 3' 2.5"
Number of Doors: 16
Kind of Foundation and Depth Below Surface: Mud & sand, 35 feet
Character of Soil Surrounding the Lighthouse:
Soil Susceptibility:
Miscellaneous Remarks: Circular dwelling on octagonel screwpile foundation, and supporting lantern with illuminating apparatur.
Lantern and Fixtures
Order of Lantern: 4th
Shape of Lantern: Cylindrical
Diameter to Glass: 76.5 inches
Diameter in the Clear:
Number of Sides:
Type of Bars: Helical
Thickness of Bars:
Height Glazed: 35 5/8"
Number of Plates in Height: 1
Number of Plates Each Side: 1
Thickness of Plates: 3/8"
Size of Plates: 12" x 29" x 37"
Number of Storm Panes:
Unglazed Side of Lantern:
What Bearings:
Construction Material Lantern: Iron
Construction Material Roof / Cowl: Iron
Ventilator / Cowl: Iron
Lightning Spindle: Iron
Description of Lightning Rod: Iron rod extending from ball of lantern
Balustrade: Iron
Lantern Doors: Iron, fitted with hinges to outside of lantern
Floor of Lantern: Iron
Watchroom Doors: Iron, fitted with hinges to floor of lantern
Parapet Diameter: 6 feet
Location / Number: Lower part of lantern
Ladders / Cleaning Arrangement: One, wood
Curtain Hooks / Hanger: Screwed

How is Watchroom Fitted: Fitted with service table and shelves
How is Relief Called:
Where is Call System Led:
Illuminating Apparatus
Kind of Apparatus:
Intensity in Candles:
Name of Maker: L. Sautter Co.
Year Made: Not given
Marks and Number: None
Order of Apparatus: 4th
Inside Diameter: 19.5 inches
Light Characteristic: Fixed white with red sector
Time of Revolution:
Flash Interval:
Duration of Flash:
Arc of Each Fixed Part:
Number of Panels: 4
Number of Flash Panels:
Arc of Each:
Number of Elements in Central Drum: 5
Number of Prisms Above Center Drum: 5
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: Iron
Service Table: Iron
Draft Tube Description: None
Revolving Machinery:
Standby and Description:
Chariot Float or Balls:
Chariot Description:
Length of Drop Tube:
Clock Weight:
Length of Winding Time:
Drive During Rewind:
Machinery Protection:
Lens Protection:
How Color is Produced: Ruby glass
Red Sectors Description: 133 degrees 30' true (SE 3/8 S) mag. & 334 degrees 30' true (N 7/8 W) mag.
Where Color Attached: To lantern
Form of Colored Glass:
Lamp Description: 4th order, one wick
Type of Illuminant:
Number of Spare Lamps: 2
Number of Spare Burners: None
Candle Power:
Closets and Store Rooms
Tower Closet Use:
Oil House Description: Room on 1st floor, fitted with stand
Oil House Inside Dimension: 30" x 84"
Oil House Construction Material: Wood, covered with zinc
Oil House Capacity: 50 5-gallon cans
Other (Describe): Closets on first floor, fitted with shelves for general purposes.
Suitability: Suited
Fog Signal General
Fog Signal Kind: Custer Bell Machine
Time to Start: 2 minutes
How Long Will Pressure Last:
Manufacturer: Not known
Year of Manufacture: Not known
Characteristic: A single blow every 12 seconds
Duplication: None
Timing Device:
If whistle, siren, or trumpet, Pressure at Which Blown:
Height Above Water:
Compass Direction:
Distance and Direction:
Water Supply:
Reached from Lighthouse:
Description of Fog Signal Building:
Pressure And Recording Gauge:
Bell Signal
Weight: 1,000 lbs.
Metal: Bell metal
Diameter: 31"
Height: 24.5"
Time: 45 minutes
Weights for Operation:
Location: Tower and dwelling one structure
Coloring: Brown
Construction Materials: Iron lined with wood
Number of Rooms: 5
Number of Dwellings:
Heating Plant:
Number of Keepers: 2
Furnished Quarters:
NOT Furnished Quarters:
Outhouse Coloring:
Paths and Walks:
Area Inclosed:
Area of Garden:
Area Timber or Shrubbery:
Cultivation Area Available:
Area Cultivated:
Character of Surroundings:
Stove, Maker:
Stove, Size:
Sink, Maker:
Sink, Size:
Pump, Maker:
Pump, Size:
How Procured: From roof
Quality: Good
Quantity: Ample
Injury Possible: Not liable
Purity Precaution: Tanks cleaned when necessary
Tank Capacity: 3 tanks, 200 gallons each, on first floor
Tank Material: Iron
Distilling Apparatus: False
Distilling Manufacturer:
Well Description:
Well Diameter:
Well Lining:
Pump or Bucket:
What Power Used:
Distance from Dwelling:
General Opinion: Good
Diseases: Malaria
Prevalency: Spring and fall
Local Causes: No
Recommended Improvements: