Archived posting to the Leica Users Group, 2013/12/12

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Subject: [Leica] IMG: From Long Ago
From: jhnichols at lighttube.net (Jim Nichols)
Date: Thu, 12 Dec 2013 22:35:59 -0600
References: <14950582.1386889602288.JavaMail.root@elwamui-polski.atl.sa.earthlink.net> <CAH1UNJ0GDphHbKY=f2Y0ZPQMC4SXE_S4aLWQVvR_nnm2ebq2sg@mail.gmail.com>

:-) :-) :-) Thanks for looking.

Jim Nichols
Tullahoma, TN USA

On 12/12/2013 9:52 PM, Jayanand Govindaraj wrote:
> It sure does!
> Cheers
> Jayanand
>
> On Fri, Dec 13, 2013 at 4:36 AM, al crouch <al.crouch at earthlink.net> 
> wrote:
>> Looks like the world's largest music box drum.
>>
>>
>>
>> -----Original Message-----
>>> From: Jim Nichols <jhnichols at lighttube.net>
>>> Sent: Dec 12, 2013 4:19 PM
>>> To: "LUG at Leica-Users.org" <lug at leica-users.org>
>>> Cc: Olympus Camera Discussion <olympus at thomasclausen.net>
>>> Subject: [Leica] IMG:  From Long Ago
>>>
>>> As a young engineer, my first assignment was to calculate the nozzle
>>> plate shapes for a flexible plate nozzle for the AEDC 16-Ft Transonic
>>> Wind Tunnel, then under construction.  The shapes had to vary from a
>>> simple contraction to a Mach 1.6 contour, and the process had to be done
>>> by 16 pairs of jacks, without over stressing the steel plates.  And,
>>> other than the basic supersonic shapes calculated by folks at Cal-Tech,
>>> it was all done on Friden and Marchant desk calculators.
>>>
>>> To move the jacks from contour to contour, a series of steps were chosen
>>> that stayed within stress limits, as determined from curvature
>>> calculations. These steps were then stored in L-shaped pegs on a
>>> mechanical memory drum, with the shapes transferred to cam-driven
>>> readers and fed to vacuum-tube amplifiers which supplied the driving
>>> signals to the ball-bearing screw jacks.
>>>
>>> Bear in mind that this was all done in the early 1950s.
>>>
>>> This photo, taken from my technical report, shows the mechanical memory
>>> drum and the console which contained the drum drive system, the transfer
>>> plate, and the individual jack amplifiers.  The console and system were
>>> designed to our specs and provided by an engineering company whose name
>>> does not come to mind after 60 years.
>>>
>>> http://gallery.leica-users.org/v/OldNick/Mechanical+Memory+Drum.jpg.html
>>>
>>> Memory has come a long way since then. :-)
>>>
>>> --
>>> Jim Nichols
>>> Tullahoma, TN USA
>>>
>>>
>>>
>>> _______________________________________________
>>> Leica Users Group.
>>> See http://leica-users.org/mailman/listinfo/lug for more information
>>
>> _______________________________________________
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> _______________________________________________
> Leica Users Group.
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>
>




In reply to: Message from al.crouch at earthlink.net (al crouch) ([Leica] IMG: From Long Ago)
Message from jayanand at gmail.com (Jayanand Govindaraj) ([Leica] IMG: From Long Ago)