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 / StellSegment Coding. The keyboard pre-sets the gears of the INPUT UNIT ... ... 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. ( The sketch doesn't show the locking of a pressed-down key ) Back to the MARCHANT-H9 Main Page ... R E M A R K S : 6th »BBST« in the ENERGIE-MUSEUM on 9th October 2010 ============================================================================== 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: ****************************************************************************** © C.HAMANN http://public.BHT-Berlin.de/hamann 10/10/2010 |