Manufacturer: Blundel Harling
Country of Manufacture: England
Type: Pilot Balloon Mark 5
Number: 4053/69
Date of Manufacture: 1969?
Scales: (Front) Log, Cos, Sin [C C Graticule] Secant2, Tan
Scales: (Back) None
Number of Scales: 8
Gauge Points:  
Slide Rule made from: Plastic
Cursor made from: 4 Plastic
Cursor Lines: 1 on each cursor
Overall Length of Rule: 63.2 cm
Length of Scales: 59.6 cm
Width: 6.2 cm
Depth: 1.2 cm
Acquired from: Sean Clarke
Date: March 2004
Condition: Good
 Wooden Case (Medium Condition)
 Instruction Book (English)