Dear Peter & All,
Questions like this send me off to my shelf in
search of my copy of Dowland's translation of the
'Micrologus' of Andreas Ornithoparchus, a compendium
of music theory originally published in Leipzig in 1517
which Dowland translated and published in 1609.
In chapter 5, under the heading 'of prolation' we find that
a point enclosed by a circle symbolises the 'greater prolation'
which equates to a 'semibreve measured by three minims.'
The unbroken circle symbolises perfect time (because in
Medieval symbolism the holy trinity is perfect?).  So in applying
this to Dalza's recercar on f. 7, the piece starts in triple time
with each measure having a value of a semibreve. The first three
measures indeed have three minims each.

Over the page on f.7v the time changes with the sign of a broken
circle with a vertical line through it and a numeral 3 set against it.
The broken circle indicates imperfect (i.e. duple) time. The tables
in the Micrologus suggest that the vertical line indicates a 'diminution'
and the numeral 3 indicates that the diminution is of a factor of 3.
The definition of a diminution is a little confusing: apparently 'the
ancients'
considered it to consist of reducing the length of a measure by a third,
whilst
'the moderns' consider it to be reducing the length of a measure by a half.
But it
goes on to say that a number placed against the diminution sign  indicates
the value of the diminution.

My guess is that the sign in measure 4 of the Dalza recercar on f.7v
indicates
that the semibreve measure length is now reduced by a third, (following
the 'Ancient' interpretation). This is exactly what happens in the music -
we
now have two minims per measure instead of three. This would mean that the
duration of a minim remains the same but the time changes.

If anyone has a better informed interpretation of this I would
be delighted to know!

Best wishes,

Denys




----- Original Message -----
From: "Peter Nightingale" <[EMAIL PROTECTED]>
To: "Lute List" <[email protected]>
Sent: Tuesday, October 24, 2006 2:35 PM
Subject: [LUTE] Dalza


> Dear List,
>
> Does anyone know what the time signature in Dalza (Intabulatura de Lauto,
> 1508) Recercar f7r means.  The first symbol is an O with a dot in the
> middle and it starts in triple meter 1 1 1 | 1 1 1 | ... (1 stands for a
> single flag).  In measure 29 a c-slash (as in alla breve) followed by a
> big 3: 1 2 2 | 2 2 2 2| ...  What is one supposed to do? Speed up as in |
> 1 1 1 | -> | 1 1 | 1 1 |; or slow down as in | 1 1 1 | -> | 1 1 |; or does
> the 1-beat stay the same; or ...
>
> Thanks,
> Peter.
>
> the next auto-quote is:
> A tyrant must put on the appearance of uncommon devotion to religion.
> Subjects are less apprehensive of illegal treatment from a ruler whom
> they consider god-fearing and pious.  On the other hand, they do less
> easily move against him, believing that he has the gods on his side.
> (Aristotle)
> /\/\
> Peter Nightingale                  Telephone (401) 874-5882
> Department of Physics, East Hall   Fax (401) 874-2380
> University of Rhode Island         Kingston, RI 02881
>
>
>
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