This is an original 1927 one-page article (one single-sided page) by Paul Welker on how sound waves are filtered.
This 84+ year old Item is rated Very Fine +++. Light aging throughout. Light creasing. No natural defects. Some light surface rub. No tears. No water damage. Please note there is print on the reverse, thus some bleed through may be present.
Product Type: Original Print Article; Black / White
Grade: Very Fine +++
Dimensions: Approximately 7.75 x 10.75 inches; 20 x 27 cm
Authentication: Serial-Numbered Certificate of Authenticity w/ Full Provenance
Protection: Packaged in a custom archival sleeve with an acid-free black board (great for display, gift-giving, and preservation)
Keywords specific to this image: Science, Music, Radio, University of Iowa, Pitch