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Fig. 6 End of Tailpiece
go somewhere and since there is
insufficient room in the tangent
box it probably lies along the
right hand side of the instrument
parallel with the trompette drone.
The bridge for this bass drone
is hollow and cut away to contain
a small ivory bridge for the (Fig.7)
trompette which is adjusted by a small peg in the tailpiece. .«hen
the trompette drone is correctly adjusted it should buzz rather like
a tromba marina when the wheel is rotated faster than usuai, ott.erwise
it gives a clear tone. With this device it is possible to produce a
rhythm by means of irregular wheel rotation and this stands out rather
like a crumhorn above the general drone of the instrument.
THE WHEEL AIA) COWL
I have made the wheel of segmenta in order to eliminate end grain
and the possibility of irregular expansion from varying weather conditions.
Other methods of construction can be used including lamination and
solid wheels, the latter no doubt being the type used in Bosch's time.
In order to overcome end grain problems on a solid v.heel it can be
covered with a rim of parchment and if a stable wood such as pear is
used then trouble with eccentricity can be reduced. In my roconstruction
Fig. 7 Trompette Bridge
I have ocrewed the wheel to a
brasa boss which in turn is held
onto the axle by a small grub
screw. The axle ia of 6 mm
brasa bar with an "S" shaped
brasa crank Silver soldered
on to it3 end boss. This is
the only external deviation
from the originai since the
handle in the originai has
obviously been elongated to
allow room for a condemned soul who has the eternai job of turning
the wheel. A turned wooden knob Is mounted on a short axle at the
end of the crank and compietes the handle mechanism.
The cowling over the wheel is simply a bent sheet of wood. I
have used a piece of sycamore 3 mn thick and steam bent around a
piece of 15 cms diameter steel tubing giving the oowl an almost
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