Manufacturer:	Halden
Country of Manufacture:	England
Type:	Calculex (Circular)
Number:
Date of Manufacture:	1915+
Scales: (Front)	L, A [B, R1, R2]
Scales: (Back)	S, A [BI, K1, K2, K3]
Number of Scales:	11
Gauge Points:	π, q
Slide Rule made from:	Metal Frame with Glass Front and Back
Cursor made from:
Cursor Lines:	1 front, 1 back
Overall Length of Rule:	6 cm Diameter
Length of Scales:
Width:
Depth:	0.7 cm
Weight:	50 gm
Acquired from:	Joel Goodman
Date:	May 2001
Condition:	Good
Accessories:	Leather case. Good Condition Instructions (English). Good condition
Comments:	JOS Vol 6, No. 2 "Joseph Halden: A Slide Rule Manufacturer of Manchester"