New PDF release: Art and Technics

By Lewis Mumford

Lewis Mumford — architectural critic, theorist of expertise, urbanist, cultural critic, historian, biographer, and thinker — used to be the writer of just about thirty books, lots of which expounded his perspectives at the perils of city sprawl and a society enthusiastic about “technics.”

In those lectures brought at Columbia college in 1951, Mumford explores the moral difficulties that drove all of his writings on paintings, know-how and urbanism: the severing of the bonds of fellowship and neighborhood in complicated business society; the waning feel of a public reliable and the ensuing ethical quandary of recent existence; the cultural divide isolating an instrumental language of strategy from the symbolic language of aesthetic event; and the plight of ‘personality’ in a bureaucratic age.

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Extra resources for Art and Technics

Sample text

5 doppelt so hoch sein wie die in Tab. 4. Dies trifft indessen nicht ganz zu. Die mittleren Effektivwerte der drei Leiter3* 36 I. Der magnetische Kreis Tabelle 5. Verteilung der Magnetisierungsströme beim Drehstrom-Manteltyp Strom in den Leituugen I Schaltung Eingang! Ausgaug I lOR los lOT I [Al [Al [Al 2,42 2,25 3,12 2,7 1,1 1,01 0,43 0,14 Stern/Stern mit Sternpunktleiter auf der Eingangsseite Effektivwert I Grundschwingung 3. Oberschwingung 5. " 7. " 9. 3,12 2,7 1,1 1,01 0,43 0,14 3,24 3,0 Dreieck/Stern Effektivwert Grundschwingung 3.

Das Zahlenbeispiel zeigt, daß bei Dreieckschaltung einer Wicklung die Scheinleistungsaufnahme des Drehstromsatzes um etwa 20 % V3 Tabelle 6. Verteilung der Magnetisierungsströme beim Drehstrom-Tran8jormatorensatz I Strom in den Leitungen Strom im Sternpunktleiter [A] Umlaufstrom im Dreieck [A] Effektivwert Grundschwingung 3. Oberschwingung 5. " 7. " 9. 1 0,75 0,55 0,28 0,12 0,07 1,66 - 1,65 - 0,81 0,75 Dreieck/Stern Effektivwert Grundschwingung 3. Oberschwingung 5. " 7. " 9. Stern/Dreieck Effektivwert Grundschwingung 3.

22. Schichtplan eines Drehstromkernes mit einkernes nach Abb. 22 liegen in gezeichneten Kraftlinienpfaden a 90 o -Verzapfung, b 45°-Verzapfung den beiden äußeren Kraftlinienpfaden je drei Verzapfungen, im mittleren Kraftlinienpfad aber nur eine Verzapfung. Werden die Joche dagegen stumpf auf die Schenkel aufgepreßt, so sind die Unterschiede in den magnetischen Widerständen um so geringer, je größer die Stoßfugen sind. Ein gewisser Ausgleich ist durch Verstärkung des Jochquerschnittes oder durch Verringerung des Querschnittes des mittleren Schenkels er~-- t I t t t t 4.

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Art and Technics by Lewis Mumford

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