Fig. 6From: Spectacular rediscovery of the original prints of radiographs Roentgen sent to Lorentz in 1896A wooden take-up spool with wire. This image shows that the wood of the spool is practically transparent to the X-rays while the wire is not. Manually written legend: ‘Holzspule mit Drahtwickelung’ (Wooden take-up reel with wire). Paragraph referral: § 14Back to article page