Full Details

Name and Model Number Poper's Musical Slide Rule
Country of Origin USA
Date of Manufacture Est 1930- 1950
Front Scales Major keys, number of sharps, number of flats, relative minor keys, major scales up-down, relative minor scales up, relative minor scales- down, note transposition, chords
Back Scales None
Scale Length 15 cm (6 inch max)
Type of Rule Slide Chart
Construction Plastic
Area of Use Other
Comment Used for musical composing
Rarity RR
Donor Collection of Clay Castleberry
Match Number 367
(Click Picture for Details)

In conjunction with our 'donors' we assign a rarity rating to each item, based on the system devised by Herman van Herwijnen
(1929 - 2004), renowned Dutch collector, author, and creator of Herman's Archive, a collection of 5,000 slide rule images on CD.
• RR = Rare - 1 of 25 collectors has one; it may take a year to find an example in the marketplace.
• RRR = Very Rare - only a few known to collectors; may be several years before it comes up for sale.
• RRRR = Extremely Rare - a museum piece; unlikely that an example will come up for sale.