Full Details

Name and Model Number Scientifiic Instrument Company
Model 1610 D
Country of Origin USA / Japan
Date of Manufacture 1972
Front Scales LL3 LL2 LL1 LL0 K A D C CI B E1
Back Scales LL3 LL2 LL1 LL0 P L DI D C
Scale Length 37 cm (14.75 inches) for longest scale
Type of Rule Disc
Construction Plastic, circular construction with separate cursors for each side and a separate inner sliding disk for each side.
Area of Use Generic
Comment Used for logarithmic and trigonometric calculations. A very complex circular slide rule. This company was also known by the initials SIC.
Rarity RR
Donor Collection of Clay Castleberry
Match Number 368
(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.