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Author Topic: need a wiring diagram for Hertner Transverter John Eickhof Jedi Master Film Handler Posts: 588 From: Wendell, ID USA Registered: Jan 2000 posted 01-25-2015 07:12 PM                        I've dug through all my RCA & Altec service manuals and can't come up with a wiring diagram for a Hertner Transverter model 40/80 carbon arc motor-generator, I am going to set one up in my museum's 1940s E7/peerless booth for one KW arcs. Can anyone email me a JPG of the wiring info, especially the field control rheostat circuit? Thanks all, I know there's a few old timers left out there!  |  IP: Logged Jim Cassedy Phenomenal Film Handler Posts: 1661 From: San Francisco, CA Registered: Dec 2006 posted 01-25-2015 08:18 PM                     Don't know if these will be of any help to you. These images are from my 1927 copy of the "Richardson's Projection Handbook" - - - Pages 516. 517 & 518 If you need higher resoloution images, or if you'd like to have scans of the entire pages, which have lots of text info about the transverters, PM me and I'll send them to you. Somewhere around here I'm pretty sure I have an actual transverter manual, but I'm on my way out the door to do a screening, so I can't go 'digging' for it at the moment. Hope these images are at least some hlep to you, for now. -jc-  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 01-26-2015 06:44 AM                     Well that is kinda cool.  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 01-26-2015 10:24 AM                    In that case you'll enjoy this. These are motor-alternators making 400 Hz. to run a couple of Control Data mainframes circa late 1970s. 400 Hz. is easier to rectify into smooth, low voltage DC but if you need M-A's to make it, it might be easier to just deal with 60 Hz. So from what I could gather the real reason for the M-A sets was to isolate from power line glitches, ride out momentary outages and having the output side be 400 Hz (with smaller transformers & filter at the rectifier end upstairs) was just a side benefit.  |  IP: Logged Pete Naples Phenomenal Film Handler Posts: 1565 From: Dunfermline, Scotland Registered: Feb 2001 posted 01-26-2015 03:54 PM                     I was recently talking to a friends grandfather, an elderly gent who'd served his country in the RAF. Apparently the legendary Lancaster, Halifax and Lincoln heavy bombers had a similar device on board to provide power for the radar later in WWII. With aviation being fanatical about weight saving I was somewhat surprised, he said it was the best they could do at the time.  |  IP: Logged Frank Cox Film God Posts: 2234 From: Melville Saskatchewan Canada Registered: Apr 2011 posted 01-26-2015 04:27 PM                        The most striking thing about the Unbroken movie (to me, anyway) is how minimally equipped the bombers are. Being used to seeing the modern war movies where there's all sorts of armour and hi-tech gadgetry, those bombers (assuming that it's a historically accurate depiction) were pretty much the minimum possible mechanical components that would get a load off the ground. No armour worth mentioning and a few guys just hanging out the sides in the open air using very basic machine guns equipped with ring sights and a belt of ammunition. No such thing as a seat belt or even a seat for some of those folks.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 01-26-2015 05:13 PM                        Larger aircraft still uses 400 Hz AC.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 01-26-2015 07:13 PM                     After the war the generators were sold as surplus and many ended up being used as arc welder we had one on our farm  |  IP: Logged John Eickhof Jedi Master Film Handler Posts: 588 From: Wendell, ID USA Registered: Jan 2000 posted 01-26-2015 09:23 PM                        400 Hz was used primarily on all aircraft made in USA during WW2 for communications, radar, IFF and navigation as the higher frequency allowed for much smaller and lighter electronics ie: transformers,chokes etc. The laminated cores were considerably smaller for the higher frequency without developing additional heat loss. Electric motors also were very small and efficient.  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 01-28-2015 09:21 AM                    There are probably still plenty of elevators running on MG sets. Many (most?) have been updated but it's a larger undertaking than simply dropping in a transformer & rectifier because field current is part of the control system.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 01-28-2015 09:56 AM                     Aircraft use 400 hz because everything associated with it is smaller and lighter. Mark  |  IP: Logged Pete Naples Phenomenal Film Handler Posts: 1565 From: Dunfermline, Scotland Registered: Feb 2001 posted 01-28-2015 09:58 AM                     It never ceases to amaze me the wealth and breadth of knowledge us projection dinosaurs have on tap!  |  IP: Logged Jeff Taylor Jedi Master Film Handler Posts: 601 From: Chatham, NJ/East Hampton, NY Registered: Apr 2000 posted 01-28-2015 11:01 AM                     All the electronics on WWII American subs were also powered by MG sets even under diesel power.  |  IP: Logged Charles A. Petty Film Handler Posts: 10 From: Eureka, CA/Humboldt, USA Registered: Nov 2005 posted 01-29-2015 08:59 AM                     One of the two original Actodector MG sets still in use at the Oakland Paramount theater.  |  IP: Logged Jim Cassedy Phenomenal Film Handler Posts: 1661 From: San Francisco, CA Registered: Dec 2006 posted 01-29-2015 10:37 AM                     quote: Steve Kraus There are probably still plenty of elevators running on MG sets One of the screening rooms I work at is located in a building that dates back to 1914. The elevator control system probably dates back to the early 1930's. Big friggn'-huge motor generators, and thyratron control tubes, and more relay racks than you'd find in an old telephone company switching office. I recently took a friend down to the basement to see it and he was in awe. Next time I'm there, I'll try & get some pictures!  |  IP: Logged

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