Air Raid Siren

DIY Dynamic Flywheel Balancing
- https://www.youtube.com/watch?v=SkqCBcPGDEE
- TL;DW: mount it in a lathe with 3 weight attachment points, measure wobble, move weights, measure wobble, repeat till fixed.
Wooden Example
- https://hackaday.com/2013/03/31/building-a-wooden-air-raid-siren/
- 6 hole, 10 hole, two pitches.
- 600 hz is a good rough upper limit for the high pitch
- 600 hz / 10 holes = 60 rps / 3600 rpm
- hand crank can produce about 1 rps
- 600 hz / 5:1 gear = 120 holes.
- 600 hz / 5:4:1 gear = 30 holes (18 holes undertone).

1526 W. Main

floor 1	floor 2	floor 3
roof looks OK	underground tacos	WANT GIANT HSL SIGN

Main showroom front windows.	East end of main showroom area.	West end of main showroom area.
Northwest of loading bay.	Southwest of loading bay.	East of loading bay, joining warehouse.
Power 1	Power 2	Power 3
Office Space (red Swingline stapler not included)	Conduit in the middle-back of the showroom floor.	Bathroom (bathrooms? the other one was locked)
Westward view of warehouse.	Southwestward view of warehouse / office walls.	actual southeastward view of warehouse