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MARCHANT H9 RESTORATION & ADAPTING SEGMENT PRINCIPLE The Cover of Input- & Counter-Unit is removed ...  ... and also the Cover on front. The calculator came in bad shape: The BLACK "6"-KEY & the "X"-KEY ( on the right ) were missing Temporarily replacement for the MISSING CRANK: A handle from a toilet flush is used! The Replacement Parts in process ( see Remarks ) ... 
Detail View of the ADAPTING SEGMENT in Action: Keys 1-2-3-4-5-6-7-8-9 are pressed ...  |
The MARCHANT company got in PATENT TROUBLES with the ODHNER company using
"Pin Wheels". Employee Carl M.F. FRIDEN ( later he founded his own company )
designed a new type of calculators using ADAPTING SEGMENT (= "Stell-Segment")
Coding. The keyboard pre-set the gears of the INPUT UNIT ( upper-left -
in a way similiar to COMPTOMETERs ! ) - and with the turn of the MAIN CRANK
this gears get moved radially so, that only the appropriate number of teeth
turn the gears in the ARITHMETIC UNIT.
Back to the MARCHANT-H9 Main Page ...
R E M A R K S : 6th »BBST« in the ENERGIE-MUSEUM on 9th October 2010
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Demonstration of this Calculator at the »Berlin-Brandenburger Sammler-Treffen«
Special "THANKS!" to the labs of my university for their contributions in
restoring this MARCHANT for this event - AND! - for their friendly assistence
in former times: Always making the impossible possible ...
Fachbereich » Informatik & Medien «
Prof.Dr.Bernhard Buchholz,
Andreas Doepkens & Brian Schueler, Labor »Prozess- & Systemtechnik«
Andreas Graebe, Labor »Automatisierungstechnik«
Fachbereich » Elektro- & Feinwerktechnik «
Thorsten Sohr, Labor »Geraetetechnik, Optik & Sensorik«
Fachbereich » Maschinenbau, Verfahrens- & Umwelttechnik «
Mario Schubert, Labor »Kunststoffverarbeitung & -pruefung«
Andre Zuehlsdorf & Frank Hauser, »Labor Produktionstechnik«
impressum:
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© C.HAMANN http://public.beuth-hochschule.de/~hamann 10/09/2010
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