File:Liebniz-rechenmaschine hg.jpg
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Summary edit
DescriptionLiebniz-rechenmaschine hg.jpg |
Calculator constructed by Gottfried Wilhelm Leibniz. (Exhibition of University Hannover) Leibnizsche Vier-Spezies-Rechenmaschine (Hannoversches Modell 2005): Das Modell mit 6 Eingabe- und 12 Resultatstellen sowie 1 Zählwerkstelle ist so weit wie möglich authentisch in Bezug auf die einzige erhaltene, große Leibnizsche Rechenmaschine, deren Bau kurz vor 1700 begann und die Verbesserungen bis kurz vor dem Tode Leibniz' im Jahre 1716 erfuhr. Aus der konstruktiven und mathematischen Optimierung anhand der analytischen Erfassung der Getriebekinematik konnte erstmals der korrekte Zehnerübertrag durch Weiterdrehung der Magna-Rota-Kurbel um 87° über 360° hinaus (mit Begrenzung durch Bolzen) bei beliebiger unveränderter Eingabezahl verwirklicht werden. Hierfür sind die von N. J. Lehmann, Dresden, 1988 als notwendig erkannten von rechts nach links abnehmenden Zweihorn-Spreizwinkel von Bedeutung. Die Leibnizsche Maschine mit Staffelwalzen für die Zahleneingabe (statt mit Sprossenrädern wie in der ersten 1673 fertiggestellten Maschine) wird durch eine Kurbel, die Magna-Rota-Kurbel, angetrieben. Multiplizieren geschieht durch wiederholtes Addieren in verschiedenen Schlittenstellungen (verschoben durch die Schlittenkurbel mittels einer Zugspindel) und Dividieren durch wiederholtes Subtrahieren. |
Date | |
Source | Own work |
Author | Hannes Grobe |
Licensing edit
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 10:39, 26 September 2010 | 4,063 × 1,229 (751 KB) | Hgrobe (talk | contribs) |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D700 |
Author | Hannes Grobe |
Copyright holder |
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Exposure time | 1/40 sec (0.025) |
F-number | f/3.2 |
ISO speed rating | 200 |
Date and time of data generation | 14:45, 19 August 2010 |
Lens focal length | 28 mm |
Orientation | Normal |
Horizontal resolution | 240 dpi |
Vertical resolution | 240 dpi |
Software used | Adobe Photoshop CS4 Macintosh |
File change date and time | 21:28, 22 August 2010 |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 14:45, 19 August 2010 |
APEX shutter speed | 5.321928 |
APEX aperture | 3.356144 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire |
DateTime subseconds | 50 |
DateTimeOriginal subseconds | 50 |
DateTimeDigitized subseconds | 50 |
Color space | Uncalibrated |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 28 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Image width | 4,063 px |
Image height | 1,229 px |
Serial number of camera | 2215184 |
Lens used | 24.0-70.0 mm f/2.8 |
Rating (out of 5) | 0 |
Date metadata was last modified | 23:28, 22 August 2010 |
Unique ID of original document | xmp.did:91D14BEC08206811871FF583A2CCE642 |