Full Details


Name and Model Number Sexton's Omnimetre No. 1
Country of Origin England
Date of Manufacture 1897-1910
Front Scales L, A [B, squares, cubes, secants, sines, tangents, vers sines]
Back Scales None
Scale Length 18.3 cm diameter
Type of Rule Disc
Construction Cardboard
Area of Use Generic
Comment  
Rarity RR
Donor Collection of Rod Lovett
Match Number 22
Thumbnail


RR = Rare -- 1 of 25 collectors has one; it may take a year to find an example in the marketplace.   
RRR = Very rare -- only very few known to collectors; may take several years before one comes up for sale.   
RRRR = Extremely rare -- a museum piece; unlikely that an example will ever come up for sale.