PDO
State
Locality
County
Lat
Lng
Number Have/Had
Type
In Place?
In Service?
Piston Type
Notes
Arizona
Globe
Gila
33.412368
-110.814996
1
B
No
No
Unk
This horn was on the top on the police building in Globe for over 50 years and was blown at 10 PM until 1990
California
Benicia
Solano
38.053979
-122.156448
1
B
No
No
Unk
Removed when new station was built
California
Burney
Shasta
40.881864
-121.669571
1
Unk
Yes
No
Unk
California
Carmichael
Sacramento
38.588805
-121.417864
2
B
No
No
Unk
Horns were located at Station 1 and Station 2
California
City of Eureka
Humboldt
40.804165
-124.169776
1
Unk
No
No
Unk
The city of Eureka Calif. used to have a Diaphone signal that was blown twice every day. Once at noon and again at midnight followed by the city air raid siren. The Diaphone was mounted on top of the cities water tank approx. 200 feet up and the air raid siren was at ground level. Sometime in 1985 they had decided that the horns and siren had outlived their usefulness and were scrapped due to upkeep expense. John Anderson
California
Greenville
Plumas
40.14003
-120.951922
1
Unk
Yes
No
Unk
They have a spare reducer and Smith Valve. Horn works just not used.
California
City of Larkspur
Marin
37.9344
-122.53514
1
B
Yes
Yes
Unk
One of the most famous Diaphones! Has a Smith Valve.
California
City of Orange
Orange
33.786827
-117.850691
1
B
No
No
Aluminum
Was in the process of being restored after being found. Has a Smith Valve.
California
Red Bluff
Tehama
40.175622
-122.235061
1
Unk
Yes
No
Unk
California
Town of San Anselmo
Marin
37.974752
-122.56256
1
Unk
Yes
Yes
Unk
In service for flood warnings.
California
City of Sierra Madre
Los Angeles
34.163284
-118.052598
1
B
Yes
Yes
Unk
The City of Sierra Madre California still has its system up and running since 1940. It is sounded every day at noon. This Diaphone was featured in the 1955 movie Invasion of the Body Snatchers. - Jim Hill
California
City of Vernon
Los Angeles
34.005165
-118.230334
1
Unk
No
No
Unk
City of Vernon FD
California
Weaverville
Trinity
40.729464
-122.938908
1
Unk
Yes
Yes
Unk
Weaverville in far northwestern California installed a Diaphone and a small box network in the early 1950s with a horn and equipment from Redding CA and technical assistance from Ukiah CA. The Diaphone and Smith Valve are still operational and while not TOOTed regularly the horn does go off on its own occasionally! - Jim Armstrong and Ex-Chief Dick Berrien
System put together with a horn from Redding and a manual from Ukiah.
California
Ukiah
Mendocino
39.14782
-123.2083
2
B
No
No
Aluminum
Had two horns into the mid-seventies with boxes and codes one could look to for locations. Believed to now be the ones owned by Jim Armstrong.
California
Grass Valley
Nevada
39.219444
-121.061059
1
Unk
No
No
Unk
Grass Valley FD. Horn was located on City Hall.
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