Archived posting to the Leica Users Group, 2013/12/12
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]:-) :-) :-) 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 >> >> _______________________________________________ >> 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 > > >