Hello,  I was fortunate enough to pick up an Erlebach & Gershwin
Universal Song Roll at the local Op-Shop (a second-hand charity shop).

Universal Song-Roll 2205
Ain't You Comin' Back to Dixieland? (Whiting)
p.b. Erlebach & Gershwin [July 1917]

The roll has additional hole patterns -- groups of two small holes --
near each edge.  Please refer to attached images.

Can someone tell me the purpose of these extra holes?

Regards,
Jase Haysom
m.haysom@cartography.id.au.geentroep [delete ".geentroep" to reply]

 [   Universal 2205 roll label
 [ http://www.mmdigest.com/Attachments/20/03/05/200305_054645__IMG_0992.jpg
 
 [   detail of right and left roll edges
 [ http://www.mmdigest.com/Attachments/20/03/05/200305_054645_2205_edges.jpg
 

 [ The tiny holes ("snake bites") cause brief note accents in pianos
 [ fitted with Themodist or Solodant systems, and also with certain
 [ reproducing systems such as Duo-Art.  I'm curious when the system
 [ was developed and who held the patent.  -- Robbie