A cracked cylinder. There are two flexible strips of preservation-friendly plastic wrapped around cracked sections to help support the cylinder during scanning. The cylinder was recorded by Alfred Kroeber. It records a Wiyot song.
Cylinder 20.2. is shown here on a white cone custom built to provide support for cylinders that are broken. The cylinder is missing a shard from the bottom but the white cone will still support it and allow it to be scanned.
Two cylinders one presumed to be a duplicate from a mold of the other. The cylinder with the lighter gray finish (right) is documented as being a duplicate of the darker colored cylinder (Left). Both cylinders record a Yana song, sung by Ishi.
Photo of Cylinders 14-1700.1(Left) and 14-1700.2 (Right) From above. Note differences in engravings and the interiors 14-1700.2 is documented as being a duplicate of 14-1700.1
Photo of cylinder 14-2314.2 with visible damage at the bottom. The white band is a preservation-friendly strip of flexible plastic. It is wrapped around damaged portions to provide support during scanning and prevent breakage. The cylinder was recorded by Alfred Kroeber. It records a Wiyot song.
The UC Berkeley Library version of the scanning machine. The machine is shown loaded with three cylinders. During a scan the probe begins at the left and is moved to the right in 1.8mm steps using precision motion controls. Because the probe is all the way to the right in this image, it is shown at the end of a scan. The black table is "floating" on pneumatic isolators that keep a layer of air between the workbench and the white table underneath. This prevents small vibrations, even those which may not be palpable or perceptible to humans, from vibrating the system and effecting measurements.
The UC Berkeley scanning machine without wax cylinders loaded. The beige cylinders on the shaft are locator plugs which slide into the cylinders while they are being scanned, to support them and keep them in place.
Photo of the whole cylinder with indentation and some white spots that may be residue from cleaning. The cylinder was recorded by Alfred Kroeber. It contains a Wiyot song.
The image shows the probe and the laser on the scanning machine. The probe measure the height at 180 points on a surface in its range. The probe can only focus on a surface in its .35 mm range. Wax cylinders typically have deformations in their surface or have some elliptical eccentricity on the order of 5mm. If the probe remained stationary then the cylinder would wander in and out of its range as it rotated. To compensate for this, the laser, whose 25 mm range is far larger than the out of roundness of the cylinder surface, measures the height of the cylinder as it rotates and relays that data to a focusing motor that moves the probe closer or farther from the cylinder to ensure that the surface stays in its range.
The image shows the probe and the laser on the scanning machine. The probe measure the height at 180 points on a surface in its range. The probe can only focus on a surface in its .35 mm range. Wax cylinders typically have deformations in their surface or have some elliptical eccentricity on the order of 5mm. If the probe remained stationary then the cylinder would wander in and out of its range as it rotated. To compensate for this, the laser, whose 25 mm range is far larger than the out of roundness of the cylinder surface, measures the height of the cylinder as it rotates and relays that data to a focusing motor that moves the probe closer or farther from the cylinder to ensure that the surface stays in its range.
The UC Berkeley Library version of the scanning machine. The machine is shown loaded with three cylinders. During a scan the probe begins at the left and is moved to the right in 1.8 mm steps using precision motion controls. Because the probe is all the way to the right in this image, it is shown at the end of a scan. The black table is "floating" on pneumatic isolators that keep a layer of air between the workbench and the white table underneath. This prevents small vibrations, even those which may not be palpable or perceptible to humans, from vibrating the system and effecting measurements.
A photo of a cylinder on the scanning machine waiting to be scanned. Some of the grooves are visible as well as damage from mold decay and cleaning solution.
One of the cylinders from the collection. A typical example in terms of its size and color. Grooves are visible and the small patches of white are damage from mold.
