|Name and Model Number||Dietzgen. Unknown model|
|Country of Origin||USA|
|Date of Manufacture|
|Scale Length||5 ins|
|Type of Rule||Slide Rule|
|Area of Use||Generic|
|Comment||I believe this slide rule probably dates to the late 1800s, though could be early 1900s.
It is made of paperboard (cardboard) and has that famous old style metal cursor.
|Donor||Collection of Wayne Harrison|
(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.|