From: rrhodes@foxtail.com (Robbie Rhodes, Etiwanda, Calif.)

> Terry Smythe's idea of microfilm (16mm) camera recording

Nope......     use a 35 mm microfilm camera, 16mm image far too
small.    70mm would be even better, but not routinely available.
Hmmmnnnnnnn........     what about an old  8 x 10 view camera loaded
with fine grain high contract film?     Most every city has a photo
studio somewhere with a large format view camera hidden in a back
storage room.

> Terry Smythe: Your 28-inch Kalliope seems like a representative "big"
> instrument.  What is the channel spacing at the star-wheels?  What is
> the normal rotational speed (seconds per revolution)?

Here's the specs you asked for.   Hopefully, a 'mask' can be developed
from these dimensions.    Let me know if further data needed.

KALLIOPE DISK MUSIC BOX¶
Coin-Op Upright Model 200 w/saucer bells¶
As per pages 110/111 of Bowers' Encyclopedia¶
Refer to illustration on page 111 for data below.

Uses 64.5 cm diameter disks (25 1/8")

The music combs are in 6 segments, 3 opposing sets

- bass - 36 notes each side = 72 notes¶
- treble - 36 notes each side = 72 notes¶
- bells - 6 each side = 12 bells

Music scale ascends from center lowest bass.¶
Bass comb segments close to center, bells on perimeter

The opposing segments span a total of 11", bottom of
bass through top of bells.

The opposing bass segments are 6 9/16" each¶
The opposing treble segments are 3 5/16" each¶
The opposing bell segments are 17/16" each

Note the spacing in the treble segments are exactly half that
of the bass segments.

The total span includes 3 idler wheels on which the disks
ride, located between the segments.    The 2 treble sections
have 2 silent notes at top and bottom opposite the 2 lower
idler wheels, for a total of 4 silent notes.

The disks have a 12 1/2" radius, from center point to outer rim.

The disks are rim driven, and the drive perforations are each
1/4" and located 12 1/8" from center point.

1st bass note is 1" from center point.¶
Last bell note is 12" from center point.

Each note is driven by an individual star wheel

+++++++++++++++++++++++++++++++++++++++++++++

•Terry Smythe                    (204) 832-3982 (voice/fax)
55 Rowand Avenue                smythe@mts.net
Winnipeg, MB, Canada   R3J 2n6  smythe@freenet.mb.ca
Home page: http://www.mts.net/~smythe