Full Details

Name and Model Number Hemmi No. 200
40 cm Scales Folded 6x
Country of Origin Japan
Date of Manufacture 1937 - 1967
Front Scales D6 D5 D4 [C6 C5 C4 C3 C2 C1] D3 D2 D1
Back Scales DF6 DF5 DF4 [CF6 CF5 CF4 CF3 CF2 CF1] DF3
Scale Length 40 cm folded 6 times = 2.4 meters
Type of Rule Slide Rule
Construction Celluloid on bamboo with metal framed glass cursor
Area of Use Generic
Comment For precision math.
Overall size 4.5 cm x 50 cm.
This is one of two precision long scale duplex slide rules made by Sun Hemmi.
The other model (No.201) folds its 50 cm scales 4 times for a scale length of 200 cm = 2 meters.
Rarity RR
Donor Collection of Ed Chamberlain, USA
Match Number 125
(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.