Fog Signal General

Fog Signal Kind:

Time to start:

How long will pressure last:

Manufacturer:

Year of Manufacture:

Characteristic:

Duplication:

Timing device:

If whistle, siren or trumpet, Pressure at which blown:

Height above water:

Compass direction:

Location:

Distance and direction:

Water supply:

Reached from Lighthouse:

Desc of Fog signal building:

Pressure and recording gauge:

Lighthouse Inspection Reports Database

Alcatraz Light Station - 1915

Fog Signal General

Sirens, electrically operated

at once

N - 5 sec blast, 15 sec silent; S - 4 sec blast, 4 sec silent, 4 sec blast, 8 sec silent

Extra sirens at N end of island

electric sign flasher

About 25'

312 degrees 35' & 132 degrees 35'

On each end of island - used for navigation of waters of San Francisco Bay.

312 degrees 35' & 132 degrees 35'

not needed

by roadway

Small frame bldgs - 4' x 7'

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Lighthouse Access | Station Boat Info | Tools and Accessories | Light Vessel Specific | Inspection Reports

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