Derailleur gears by 13 drive-train. Most road bicycles have two chainrings, and touring bicycles commonly have three. The rear derailleur serves double duty: moving the chain between rear sprockets and taking up chain slack caused by moving to a smaller sprocket at the rear or a smaller chainring by the front derailleur. In order to accomplish this second task, it is positioned in the path of the bottom, slack portion of chain. Sometimes the rear-derailleurs are re-purposed as chain tensioners for single-speed bicycles that cannot adjust chain tension by a different method. Although variations exist, as noted below, most rear derailleurs have
On the Origin of the "Influencing Machine" in Schizophrenia On the Origin of the "Influencing Machine" in Schizophrenia "On the Origin of the 'Influencing Machine' in Schizophrenia" is an article written by psychoanalyst Viktor Tausk. It was first published in 1919 in the journal "Internationale Zeitschrift für Psychoanalyse" and then, after translation into English by Dorian Feigenbaum, in the "Psychoanalytic Quarterly" in 1933. The paper describes Tausk's observations and psychoanalytic interpretation of paranoid delusion that occurs in patients diagnosed with schizophrenia. The delusion often involves their being influenced by a "diabolical machine", just outside the technical understanding of the victim, that influences them from afar. It is typically believed