[GreenKeys] UPPER and LOWER case

[Pete Lancashire]

https://en.wikipedia.org/wiki/Tempest_(codename)

On Fri, Sep 4, 2015 at 11:19 PM, drlegendre . <drlegendre at gmail.com> wrote:

> WTH is "tempest" magnetic shielding? Being that you can't actually
> /shield/ magnetic fields, the concept is even more dubious.
>
> Generally speaking, mag. fields can't be "shielded" in the standard sense.
> All that can be done is to divert the field lines so they take a 'short
> circuit' so to speak. If magnetic fields could truly be shielded,
> free-running magnetic engines would be a trivial next step.
>
> On Sat, Sep 5, 2015 at 1:07 AM, Geo. Hutchison <w7tty at centurylink.net>
> wrote:
>
>> Semi-Useless Facts.....
>>
>> The model 15 could be found with upper case J as an apostrophe on US
>> machines.
>>
>> Upper case J on a foreign 15 is a BELL Code.
>>
>> Upper case H on a civilian15 is a "#".
>>
>> Upper case H on a fully configured military machine and some civilian
>> machines was a motor shutoff code.
>>
>> The model 26 was never really suitable for press service because the R
>> and Y were next to each other.  The standard reversal test "RYRYRY" would
>> see the type wheel print one of these (I forget which) correctly, and when
>> the other character was sent the type wheel would have to make a complete
>> rotation plus one more rotary increment for the other. If the felt clutch
>> which drove the type wheel shaft was not in perfect adjustment a string of
>> RYs would not look so good.
>>
>> If the felt clutch was adjusted with more tension on the clutch to assure
>> a proper string of RYs,  it was very likely that the type wheel stop arm
>> would have more force than necessary, and the end would then break off,
>> causing the type wheel to spin endlessly.
>>
>> The model 26 had a paper feed arrangement that was really crummy.
>>
>> Model 26's seldom had a "BLANK" keylever.
>>
>> The model 26 was only equipped with a Holding Magnet selector, while 14's
>> and 15's were equipped with either, depending on what point in history they
>> were made.
>>
>> The Canadians had model 14's and 15's with TEMPEST magnetic shielding
>> over the selector magnets, and that feature only on Holding Magnet
>> selectors.
>>
>> And now you know...
>>
>> W7TTY
>>
>>
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>
>
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