Archived posting to the Leica Users Group, 2013/12/12
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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 > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information