[GreenKeys] Pretty Emma Test tape [Was Info/help]

[Sam Hallas]

Til128 at aol.com wrote:
>  The  following specimen (Pretty Emma) should be run through the
>  printer at least once  daily, preferably after the routine clean up .
>  HERE CREED PRINTER SPECIMEN SLIP PRETTY EMMA CANNOT BOWWOW THE DIZZY
>  OLD DUM=MUD=DUM

etc

Assuming it really is for a Creed machine, I'll try to understand what 
is going on.

The Creed Model 7 type selection is quite different from a Teletype. I 
assume that whatever model this was for works similarly.

The bell cranks are arranged in circle. Once the five units of code are 
received one of the cranks is selected and it drops radially inwards. 
The type head rotates inside the circle of bell cranks and is stopped by 
the dropped crank in the correct position for printing.

Note in the test tape the frequent occurrence of double letters. A 
double letter would cause the type head to perform one complete 
revolution between received characters. What that might test I'm not 
sure. Every letter except Q and V (I think) appear as a double.

I have a diagram of the order of the cranks. The first double letter is 
TT preceded by E. The crank for E is almost diametrically opposite T. 
The following Y is about 30 degrees clockwise of T so I can't deduce 
anything from that. The next double letter is MM where M is about 90 
degress clockwise from the preceding  E. Next is OWWO where O is 
diametrically opposite W. Next IZZY where I is opposite Z. D, Figs 
shift, =, letter shift, D are all nearly opposite.

It 's about this point that I give up and admit that what's going on is 
incomprehensible!

Cheers,
Sam