[GreenKeys] teletype motor with the 'night light' on it, and OTHER flickering lights

[Geo. Hutchison]

Back when U.S. 30 was a two-lane major east-west high way, they had 
problems with flickering lights.

When the highway was built it seems that in the plains states they 
thought that planting trees along the south side the highway was a nice 
way to keep tourists and truckers a bit cooler during the summer months. 
Not sure of the species but in my dimming memory it seems like they were 
tall, most likely poplar.

The long stretches of highway were nice, but as the years progressed it 
seemed that the accident rate along such highways was on a gradual 
increase.

The trees were evenly spaced, and went for miles.

As highway speeds increased,  cars began to go faster and faster, and 
the sun shining between the trees was affecting drivers who were prone 
to such things were adversely affected because as the flickering rate 
approached something like eight cycles, a person's brain could be 
affected, and seizures would result, causing an accident.

The corrective action was to cut down trees in a random fashion, thus 
eliminating the stroboscopic effect.

Even today a part of an electro-encephalogram includes a free head bath 
in a flashing light.

Yes, this is totally off-topic, but if your teletype has a governed 
motor, put the cover on the machine, and refrain from driving with the 
machine in the car.

OH - - - The mold for the 28 punch hammer heads is done and this coming 
Wednesday we'll start with a batch of 25.
The mold was machined by a fellow former nuke who needed a project for 
his machine shop class. There was no charge for his efforts, and this 
will be reflected in the price of the product!!  And they'll be MADE IN 
AMERICA!!!!

W7TTY

On 2/27/2016 9:43 AM, Ralph Mowery wrote:
> At 60 Hz there is not enough flicker from the incandescent lamp to 
> work a strobe disk.  At least not any modern lamps.  If there is any 
> flicker then there would not be any need for the tuning fork/shutter 
> to set the speed of the governed motors.
> I have not been around any 25 HZ power, but have heard that there is 
> often enough flicker in those lights to cause many people problems.
> I still have one of the turn table disks around and have used it some 
> way in the past to check the speeds. It takes a neon bulb or some 
> other gas filled tube operating off the 60 Hz house current to make it 
> work.  It will not work under any standard low wattage incandescent lamp.
>
>     ----- Original Message -----
>     *From:* Richard Knoppow <mailto:1oldlens1 at ix.netcom.com>
>     *To:* greenkeys at mailman.qth.net <mailto:greenkeys at mailman.qth.net>
>     *Sent:* Saturday, February 27, 2016 11:28 AM
>     *Subject:* Re: [GreenKeys] teletype motor with the 'night light'
>     on it!
>
>        At 60Hz there is enough flicker from a low wattage incandescent
>     lamp to work a strobe disc, for instance the little discs once
>     sold for checking phonograph turntable speed.
>        BTW, when I was a kid my parents visited the Canadian side of
>     Niagra Falls, the power there was 25Hz, I could never get quite
>     used to the flicker.
>
>
>
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