Report for Sentinel Island Lightstation (Alaska) - 1921

District: 18th
Inspector: Various
Location: On island of same name northern part of Favorite Channel.
Date of Report: 06/03/1921
Latitude: 58° 32' 40"
Longitude: 134° 54' 37"
Site: Public lands reserved by Executive Order
Date of Reservation: 01/06/1901
Date of Deed:
Date of Permission:
Date of Lease:
Area of the Entire Site: 6.55 acres
Area Inclosed: None.
Character of Soil:
Distance of tower from Nearest High-Water Mark: 110 feet.
Inclosures to Premises / Type of Fence: None.
Wharf or Landing on Premises: Small wharf with derrick.
Road to Land or Wharf Chararacter of and Distance:
Means to Reach Light Station: By gas boat from Juneau, 38 miles.Weekly mail service from Juneau by gas boat. No communication with station by telegraph, telephone or radio.
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: Lantern surmounts square tower rising from 2 story frame builidng used as dwelling.
Number of Separate Lights: 1
First Built or Established: 1902
Last Rebuilt, Repaired, or Renovated: No extensive repairs
Condition at This Date:
Shape of Tower in Plan:
Form of Tower:
Height from Base to Ventilator Ball:
Height of Focal Plane Above Mean High Water: 52 feet
Background of Lighthouse as Seen from Sea: Sky or timbered shoreline.
Color of Tower: White building, red roof
Color of Tower/ How Produced: Painted.
Tower Connection: Surmounts keepers dwelling.
Object of Navigation: For general navigation of main inside passage via Favorite Channel & Lynn Canal.
Building Materials: Wood, concrete foundation.
General Description:
Wall Thickness at Base:
Wall Thickness at Parapet:
Diameter at Base:
Diameter at Parapet:
Kind of Stairway and Steps: Wood stairway, iron ladder in tower.
Number of Landings:
Size of Glass: 10" x 10"
Number of Windows and Size of Sash: 6 - 2' 0" x 2' 0"
Number of Doors: 1 - 2' 4" x 6' 4"
Kind of Foundation and Depth Below Surface:
Character of Soil Surrounding the Lighthouse:
Soil Susceptibility:
Miscellaneous Remarks: Located on a small, rocky, flat topped, partly timbered islet. Vessels may pass on either side but the Channel on western side is the 1 most used.
Lantern and Fixtures
Order of Lantern: 4th
Shape of Lantern: Cylindrical
Diameter to Glass: 7' 8 1/16"
Diameter in the Clear:
Number of Sides:
Type of Bars: Helical
Thickness of Bars:
Height Glazed: 3' 1.25"
Number of Plates in Height: 1 & 2, alternating
Number of Plates Each Side:
Thickness of Plates: 1/4"
Size of Plates: 2' 1.081" x 2' 1.081"
Number of Storm Panes:
Unglazed Side of Lantern: None.
What Bearings: None.
Construction Material Lantern: Iron, bronze, brass, glass.
Construction Material Roof / Cowl: Conical, iron, zinc lining.
Ventilator / Cowl: Iron, 17" diameter.
Lightning Spindle: Brass, platinum point.
Description of Lightning Rod:
Balustrade: Wood, copper covered floor; octagonal, 2' 7" high.
Lantern Doors: 1 iron, hinged with lock.
Floor of Lantern: Wood; 7/8" x 4" toung & Grove.
Watchroom Doors: None.
Parapet Diameter:
Location / Number: In lantern parapet.
Ladders / Cleaning Arrangement: Wooden step ladder.
Curtain Hooks / Hanger: Spring roller curtains, brass hangers.

How is Watchroom Fitted: None.
How is Relief Called: None.
Where is Call System Led:
Illuminating Apparatus
Kind of Apparatus:
Intensity in Candles: 600 cp
Name of Maker: Henry lepaute, paris
Year Made: Unknown
Marks and Number: None.
Order of Apparatus: 4th
Inside Diameter: 19.68"
Light Characteristic: Group Flashing white every 10 sec., thus; flash 0.3 sec., eclipse 0.2 sec., flash 0.3 sec., eclipse 4.5 sec.
Time of Revolution:
Flash Interval:
Duration of Flash:
Arc of Each Fixed Part:
Number of Panels: 4; 360 degrees lens.
Number of Flash Panels:
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: Cast iron ring at floor; 4 iron post with polished brass sheeves supporting a steel plate 19" diam. & a polished brass intermediate disc.
Service Table:
Draft Tube Description: Draft tube to bentilator ball, no damper.
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: No.
How Color is Produced: White
Red Sectors Description: None.
Where Color Attached:
Form of Colored Glass:
Lamp Description:
Type of Illuminant: Acetylene
Number of Spare Lamps: No spare flasher, 2 4th order, 1 wick Funk-Heep oil lamps for emerg relief.
Number of Spare Burners: 1 spare 1.25 ft. AGA burner.
Candle Power: 54 cp of burner

Compressed Gas
Gas Container: 2 - A-5C AGA
Compressed Gas Capacity: 180 ft.
Compressed Gas Charge: 150 to 200 lbs.
How Supply Renewed: Substitution of containers
At What Intervals: Every 6 months; delivery by tenders.
Spare Containers: 2 (in transit)

Gas Light
Gas Light Kind: Acetylene in acetone.
Gas Light Number of Burners: 1
Kind of Burner: AGA flat flame
Candlepower Per Burner: 54 cp
Total Candlepower:
Consumption Gas Burner Per Hour: 1.25 cu.ft.
Total Consumption Per Hour: 1.25 cu. ft approx.
How Gas Obtained: From containers installed on 1st floor of tower.

Occulting Light
Characteristic: Group Flashing white every 10 sec., thus; flash 0.3 sec., eclipse 0.2 sec., flash 0.3 sec., eclipse 4.5 sec.
Time Limit: Not known
Eclipse Type: Valve.
Size and Amplitude:
Axis Rotation:
Axis Relation:
Screen Revolution:
Screen Number:
Screen Time:
Screen Form:
Screen Mounting:
Screen Order:
Screen Date:
Valve Maker: American Gas Accumulator Co.
Valve Pattern: Double flasher KK130
Reliability: Not entirely reliable.
Closets and Store Rooms
Tower Closet Use: Locker on attic floor level.
Oil House Description: 125 ft. NW of dwelling & 60 ft. NE of fog signal building.
Oil House Inside Dimension: 8' 3" high, 7' 10" x 11' 4" in plan.
Oil House Construction Material: Wood frame with cor. galv. sheet iron for walls, roof, ceiling. Concrete foundation and floor.
Oil House Capacity: 980
Other (Describe): Lockers in pantry; closet in each bed room.
Suitability: Suitable.
Fog Signal General
Fog Signal Kind: 3rd class Daboll reed horn
Time to Start: 10 minutes.
How Long Will Pressure Last: 6 minutes.
Year of Manufacture:
Characteristic: 5 sec. blast, 25 sec. silent, 5 sec. balst, 25 sec. silent.
Duplication: Engine, comperssor & air receiver.
Timing Device: Chain tripping gear driven by engine.
If whistle, siren, or trumpet, Pressure at Which Blown: 10 lbs.
Height Above Water: 55 ft.
Compass Direction: 246 degrees
Location: In separate building, near westerly side of island, the horn pointing toward channel on that side of island.
Distance and Direction: 160 feet 300 degrees true.
Water Supply: Rain water form roof.
Reached from Lighthouse: By concrete walk.
Description of Fog Signal Building: 1 story frame building 20' x 20'; concrete foundation & floor; white with red shingle roof; heated by coal heater.
Pressure And Recording Gauge: 4"
Internal Combustion Signal
Fog Signal Kind:
Internal Combustion Kind: Mietz & Weiss, Oil
Internal Combustion Manufacturer: August Mietz, New York
Internal Combustion Date: 1908
Internal Combustion Size: 6" x 6.5"
Internal Combustion Horsepower: 4 hp
Internal Combustion Fuel: Kerosene
Internal Combustion Starter: Kerosene torch
Compressor Maker: Clayton Air Compressor Co., 1901
Compressor Seat: Same bed - chain driven
Compressor Machinery:
Compressor Diameter: 6"
Compressor Stroke: 7"
Compressor RPMs:
Character of Air Inlet: 1.25""
Kind of Unloader: 1.25"
Diameter of Delivery Pipe: 1.25"

Daboll Signal
Daboll: 3rd class
Daboll Reed:
Daboll Length: 8-7/16"
Daboll Breadth: 2.25"
Daboll Base Thickness: 3/8"
Daboll Tip Thickness: 3/16"

Trumpet Signal
Trumpet: 3rd class
Trumpet Length: 12'
Trumpet Diameter: 3" to 40"
Trumpet Material: Copper

Air Receiver
Number: 2
Diameter: 3' 6"
Height: 7' 10"
Capacity Cubic Feet: 76 ft. each
Pressure in Each: 30 lbs.
Make of Reducing Valve: None.
Location: In same building, double dwelling
Coloring: White with red roof.
Construction Materials: Wood; 2 story frame building, shingle roof, concrete foundation & basement.
Number of Rooms: 6 rrom, bath & woodshed
Number of Dwellings: 1 double
Heating Plant: Hot air; R.B. & Co.'s "Perfect" No. 347. Has coal heater in each dining room, generally used instead of ot air furnace.
Number of Keepers: 1 each.
Furnished Quarters: Both keepers & their families.
NOT Furnished Quarters: Nont.
Outhouses: Oildhouse, shop, boat house, hoist house, 2 toilets, chinckenhouse.
Outhouse Coloring: White with lead color trimming.
Paths and Walks: Concrete walk connecting dwelling with fog-signal building & oil house.
Area Inclosed:
Area of Garden:
Area Timber or Shrubbery:
Cultivation Area Available: 1/8 acre
Area Cultivated: 1/16 acre.
Character of Surroundings: Rocky, covered with thin layer of soil; island timbered, except where cleared.
Stove, Maker: Bridge & Beach Manufacturing
Stove, Size: #168-20
Sink, Maker:
Sink, Size: 18" x 30"
Pump, Maker: Douglas
Pump, Size: #2
Lamps: 15th order table lamp, 3 hand lamps
How Procured: Rain water from roof of fog signal bld. & dwelling.
Quality: Good.
Quantity: Ample.
Injury Possible: No.
Purity Precaution: Each cistern under dwelling use for drinking water, has brick filter.
Tank Capacity: Cistern under woodshed of each dwelling, 970 gals each.
Tank Material: All concrete.
Distilling Apparatus: False
Distilling Manufacturer:
Well Description:
Well Diameter:
Well Lining:
Pump or Bucket:
What Power Used:
Distance from Dwelling:
General Opinion: Healthful
Local Causes: No.
Recommended Improvements:
Access to Lighthouse: Wharf 20' x 40'; foundation consists of iron cased concrete piers built on rock; outer face of wharf is at low water line. Steamers can not go a longside.
Distance and Direction: 350 feet 128 degrees true.
Miscellaneous Remarks: Tram leads from wharf over trestle to shore & at a point 100 ft. from wharf makes a right angle bend & continues to rear of dwelling, then around another bend to oil house. Stiff leg derrick on wharf. Hoist located at 1st bend in track
Boat #1
Boat Number: 6
Type: Dinghy
Length: 4' 10"
Width: 14'
When Built: Not known
Date Harbored at Station: Nov.7, 1916
Sails: True
Suited to Work: Yes.
Boat #2
Boat Number: 22
Type: Launch
Length: 5' 8"
Width: 18'
When Built: Unknown
Date Harbored at Station: Sept. 30, 1915
Sails: False
Suited to Work:

Power Boat
Engine Type: Sheffield Marine
Horsepower: 4.5 HP
Engine Maker: Farbands Morese & Co.
Spare Coil: Jump spark. Patroit coil compandy No. 89
Magnet: None
Battery: Dry Hatshet 5 cell
Propeller Diameter: 12"
Propeller Pitch: 18"

Hoisting Engines
Hoisting Engine Kind: Gas
Engine RPMs: 350 rpm
Engine Diameter: 6.25"
Engine Stroke: 7.75"
Engine Boiler: None.
Engine Maker and Date: Fairbanks Morse & Co., 1916
Serial Number: 118168
Cylinders and Size: 1 vertical
Horsepower: 6 HP
Fuel: Gasoline
Hoist Starter:
Hoist Miscellaneous: Double drum

General Information: Boathouse 15' x 18.5' on wharf. 1 pair boat davites on outer face of wharf.
Boats on Station: In boat hosue on Wharf.