Vorgebaut (Wendel/feld)

English translation: offset filament

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
German term or phrase:Vorgebaut (Wendel/feld)
English translation:offset filament
Entered by: Martin Purdy

08:23 Jan 8, 2014
German to English translations [PRO]
Tech/Engineering - Photography/Imaging (& Graphic Arts) / Projector/lamp specifications
German term or phrase: Vorgebaut (Wendel/feld)
Any assistance appreciated with "vorgebaut" in the following context pse:

Drei- und Zweiflügelblende, kinomatografischer Vorwärts- und Rückwärtsgang, Stillstands-Projektion; Rückwickelvorrichtung, eigens von Osram entwickelte Niederspannungslampe 200 W / 50 V mit *vorgebautem* Wendel.

Entwicklung der Kameras und Projektoren gemäß Lizenzvertrag mit der Projector GmbH (Morsbach). Konstruktive Neuerungen bei Projektoren: Filmschonendes Schalten mit günstigem Geschwindigkeitsverhältnis. Hohe Lichtleistung durch Niederspannungs-Weichglaslampe mit *vorgebautem* Wendelfeld. Einzelbildschaltung für Standardprojektion; Kupplung der Bedienungshebel mit Lampen-Widerstand und Wärmeschutzscheibe als Schutz für Lampe und Film.

Both texts refer to developments from the 1936-40 period. Not quite sure I follow what they have done with the filament/filament field in each case.
Martin Purdy
Local time: 14:41
offset filament
Explanation:
It looks like this is what is meant - the year also tallies more or less with with your subject.

"In 1931, this movement reached the point where centered filaments were no longer capable of fulfilling all the lens requirements, and lamps with offset filaments were created."

Journal of the Society of Motion Picture Engineers Vol. 19 (1930)

The PDF version is almost 40 mb, so it may take a long time to download. There's lots of other fascinating stuff in it, too.



--------------------------------------------------
Note added at 1 day6 hrs (2014-01-09 14:25:38 GMT)
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Here's a more modern Sylvania bulb with an offset filament and integrated reflector.

http://tinyurl.com/q82x9rc

An enlarger bulb (same principle) with a 90° offset filament - it certainly looks "vorgebaut" :-)

A Zeiss bulb with an offset filament (scroll down for a diagram)
http://tinyurl.com/pl3hho9
Selected response from:

Yorkshireman
Germany
Local time: 02:41
Grading comment
Excellent - many thanks!
4 KudoZ points were awarded for this answer



Summary of answers provided
4offset filament
Yorkshireman
4 -1pre-built
Alba Simoni


Discussion entries: 5





  

Answers


4 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): -1
pre-built


Explanation:
I cannot think of anything else.

Alba Simoni
United States
Local time: 21:41
Native speaker of: Native in EnglishEnglish, Native in AlbanianAlbanian

Peer comments on this answer (and responses from the answerer)
disagree  Teresa Reinhardt: definitely not; this is about the location of the lamp filament relative to the projection lens
19 hrs
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1 day 5 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5
offset filament


Explanation:
It looks like this is what is meant - the year also tallies more or less with with your subject.

"In 1931, this movement reached the point where centered filaments were no longer capable of fulfilling all the lens requirements, and lamps with offset filaments were created."

Journal of the Society of Motion Picture Engineers Vol. 19 (1930)

The PDF version is almost 40 mb, so it may take a long time to download. There's lots of other fascinating stuff in it, too.



--------------------------------------------------
Note added at 1 day6 hrs (2014-01-09 14:25:38 GMT)
--------------------------------------------------

Here's a more modern Sylvania bulb with an offset filament and integrated reflector.

http://tinyurl.com/q82x9rc

An enlarger bulb (same principle) with a 90° offset filament - it certainly looks "vorgebaut" :-)

A Zeiss bulb with an offset filament (scroll down for a diagram)
http://tinyurl.com/pl3hho9


    https://archive.org/details/journalofsociety19socirich
Yorkshireman
Germany
Local time: 02:41
Specializes in field
Native speaker of: Native in EnglishEnglish
PRO pts in category: 25
Grading comment
Excellent - many thanks!
Notes to answerer
Asker: Nice - a search for "offset filament" and "Osram" brings up lots of useful references, e.g. "There have been attempts to increase the light entering the condenser by placing the lamp filament a little in front of the mid position of the bulb, but the offset filament is not a general feature of projection lamps. " (British Kinematography, 1948). Many thanks for this.

Asker: Also here: 1X A1/113 "prefocus" 50v 200w Osram projector lamp (writing on top of box says "offset filament") - even the voltage and wattage match :-)

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