Acceptance Test Roll Scans

This page links to sample scans of various roll types from the Stanford Library piano-roll collections, mostly from the 8000-roll Condon collection. Click on roll thumbnail images in the list below to view more information about each roll as well as links to the original scans and analyses of the scans. Note that the original full-color uncompressed TIFFs are 1–6 GB.

Rolls are grouped by format. Click on a format in the list below to move to the rolls for that format.

To see detailed information about a roll, click on its icon in the list. Note that the "Automatic analysis of scan" link at the bottom of most roll entries gives a detailed, automatically generated analysis of the scan.

Here is a spreadsheet summary of the analysis:

Ampico Rolls

Ampico rolls were produced starting in 1913 and are the other most common American roll type. Click on the roll thumbnails below to view more information about each roll.

Duo-Art Rolls

Duo-Art rolls were produced by the Aeolean Company, which was one of the two dominant player-piano companies in the United States. Click on the roll thumbnails below to view more information about each roll.

Green Welte Rolls

"Green roll" are usually green-hue Welte-Mignon rolls produced from 1922 to 1932 in Freiburg, Germany by Welte & Sons. They have 98 rows of holes spaced 9 per inch, and a width of 11.25 inches. Click on the roll thumbnails below to view more information about each roll.

Welte-Mignon Licensee Rolls

Licensee rolls are mostly Welte rolls for the American market. Click on the roll thumbnails below to view more information about each roll.

Red Welte Rolls

"Red rolls" are usually red-colored Welte-Mignon rolls produced by Welte & Sons. They invented paper rolls for playing organs in the 1880's, and they were the first company to record live piano performances, starting in 1904 on these red rolls. Red rolls were produced in Germany from 1905 to 1932, and in Poughkeepsie, New York from 1913 to 1920. New York rolls sometimes have a cloth leader. They have 100 rows of holes at 8 holes per inch, with the width of the roll being about 12.9 inches. Click on the roll thumbnails below to view more information about each roll.

Tri-phonola Rolls

Tri-phonola rolls are a brand produced by Hupfeld in Leipzig, Germany during the 1920's and early 1930's. Click on the roll thumbnails below to view more information about each roll.