Full Details

Name and Model Number Schauer Mechanical Pencil
Slide Rule
Country of Origin Germany
Date of Manufacture Late 1920s
Front Scales Marked: Ho, o, u Hu, T, L, & S (equivalent to the A, B, C, D, T, L & S scales)
Back Scales none
Scale Length 10 cm
Type of Rule Other
Construction 15-cm long metal (nickel alloy ?) mechanical pencil with sliding sleeve and cursor.
Area of Use Generic
Comment Celluloid cursor window is built into pocket clip. Patented in 1926 by Joachim Schauer of Lwow, Poland.
Marked with advertising for J.M. Voith, Maschinenfabrik, Heidenheim, Germany.

Rarity RRR
Donor Collection of Ed Chamberlain, USA
Match Number 173
(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.