<div dir="ltr"><div class="gmail_default"><div class="gmail_default"><font face="courier new, monospace">For treble dominated methods, particularly at even stages, it is usual to notate all but the shortest compositions by citing the position of a fixed bell, typically the tenor, at each call. For non-differential methods without unusual features such as calls that affect more than one lead or MEBs that have more than a plain courses worth of plain leads I think such a scheme is guaranteed to work without ambiguity? Is that correct?</font></div><div class="gmail_default"><font face="courier new, monospace"><br></font></div><div class="gmail_default"><font face="courier new, monospace">For differential methods this is no longer true. For example, consider the fragment Wrong,Home applied to the unnamed differential little bob method x1x45,2: it might mean 1.4, or 1.8, or 1.12.</font></div><div class="gmail_default"><font face="courier new, monospace"><br></font></div><div class="gmail_default"><font face="courier new, monospace">A couple of further questions on this:</font></div><div class="gmail_default"><font face="courier new, monospace"><br></font></div><div class="gmail_default"><font face="courier new, monospace">1) In the example above you can disambiguate the three possible callings if you also supply the course heads (673254, 653724 and 623574, respectively). Is this guaranteed to always be possible, or are there cases where two different callings are both the same in terms both of the observation bell position and of the course heads? I conjecture that there are, but I've not successfully worked any out yet.</font></div><div class="gmail_default"><font face="courier new, monospace"><br></font></div><div class="gmail_default"><font face="courier new, monospace">2) What about differentials where all the cycles are the same length, of which three lead course royal methods are the most common example. If you leave the observation bell fixed (that is, in its original cycle), then I think this works the same as for non-differential methods. But it's not clear to me that it continues to do so if you change which cycle it's in. Is it possible to produce ambiguity in this case? I'm thinking not, but am far from certain about that.</font></div><div class="gmail_default"><font face="courier new, monospace"><br></font></div><div class="gmail_default"><font face="courier new, monospace">These points may also be relevant to a disagreement MBD and others have voiced with the Central Council's lumping three lead course royal methods and their ilk in with other differential methods that have hunt bells*. If things like three lead royal methods are better behaved with respect to ambiguity of composition description by calling position that might be taken as a point in favor of not classifying them as differential; and similarly if they are no better behaved it might be a point opposed.</font></div><div class="gmail_default"><font face="courier new, monospace"><br></font></div><div class="gmail_default"><font face="courier new, monospace"><br></font></div><div class="gmail_default"><font face="courier new, monospace"><br></font></div><div class="gmail_default"><font face="courier new, monospace"><br></font></div><div class="gmail_default"><font face="courier new, monospace">* I'm sorry, I just can't bring myself to type that horrid neologism "Differential Hunter". Oops, I just did.</font></div><div class="gmail_default"><font face="courier new, monospace"><br></font></div><div class="gmail_default"><font face="courier new, monospace"><br></font></div><div class="gmail_default"><font face="courier new, monospace"><br></font></div><div class="gmail_default"><font face="courier new, monospace"><br></font></div><div class="gmail_default"><font face="courier new, monospace"><br></font></div><div class="gmail_default"><font face="courier new, monospace">-- </font></div><div class="gmail_default"><font face="courier new, monospace">Don Morrison <<a href="mailto:dfm@ringing.org">dfm@ringing.org</a>></font></div><div class="gmail_default"><font face="courier new, monospace">"When you're a boy your life can be measured out as a series of</font></div><div class="gmail_default"><font face="courier new, monospace">uncomfortable conversations reluctantly initiated by adults in an</font></div><div class="gmail_default"><font face="courier new, monospace">effort to tell you things you either already know or really don't</font></div><div class="gmail_default"><font face="courier new, monospace">want to know." -- Ben Aaronovitch, _Moon Over Soho_</font></div><div style="font-family:"courier new",monospace"><br></div></div>
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