[ARC5] Phillips Screw

[Brooke Clarke]

Hi Wayne:

Does the article on the Phillips Screw mention that they were designed for power screwdrivers with no torque limiting to 
"cam out" the bit and so limit the torque?  The problem is that when one gets stuck it's extremely difficult to get it 
out.  (Kroil penetrating is magical for this type of thing.) If  you have a torque limiting hex driver then anything but 
a Phillips head is better.  Pozidrive, Torx and Star heads for example.
http://prc68.com/I/Fasteners.shtml#TFH

Regarding the history of vibrator power supplies I found patent:
2121421 "Vibrator Power Supply system, RCA, filed: Jun 16, 1936, class: 363/110. This uses the vibrator only on the 
primary of the transformer.
The oldest patent in the same class (3363/110) is for a "Pole Changer" used to change DC battery voltage into AC 
voltage, but not to feed a transformer.
26577 Magneto Electric Machine, G.W. Beardslee, Dec 27, 1859.

Related trivia: Note that automotive ignition systems switched from the Atwater Kent system used in the early 1900s to 
the Kittering (Delco) system around 1915.
http://www.prc68.com/I/Cars.shtml#Atwater_Kent
http://www.prc68.com/I/Cars.shtml#Kettering

-- 
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html

-------- Original Message --------
> The 800 HZ discussions have led me to once more wonder about vibrator power supplies.  I have 1945 vintage Aviation 
> magazines that have full page ads for this wonderful new invention (the same mags advertise something new called the 
> Phillips Screw).  And I have an old Heathkit VP-1 vibrator power supply that produces 60 ma at 250V with a 12VDC 
> input.  Let's see, now, do we know of any WWII aircraft electronics that require that kind of power?
> As far as higher power outputs I have the transformers from an RCA UHF Carfone I bought for $1.00 that are for a 
> vibrator power supply.  I don't know how much power that can handle but it is probably far more than an SCR-522 or 
> ARC-3 would require.  That set had 6146B's, I think
>
> So do we know why vibrator power supplies did not come out in the late 1930's and get used in WWII?
> Thanks,
>
> Wayne
> WB5WSV
>
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