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

Sun Feb 28 08:33:12 EST 2016

If you want something done right, by the book, get a nukie!

Lester B Veenstra  MØYCM K1YCM W8YCM

lester at veenstras.com

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5 Shrine Club Drive

452 Stable Ln RFD Mail

Keyser WV 26726

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From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Geo.
Hutchison
Sent: Sunday, February 28, 2016 4:11 AM
To: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] teletype motor with the 'night light' on it, and
OTHER flickering lights

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 

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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