Atomic Energy Research Establishment Circular Slide Rule | Water Contamination Calculator

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Here is a rare Atomic Energy Research Establishment (a.k.a. AERE or Harwell Laboratory) Water Contamination Calculator No. 1, circular slide rule. This device deals with the effects of an atomic burst / nuclear blast. It is still sealed and has not been opened. (The pictures shown are of an identical calculator from an opened package.) It was sealed on December 31, 1963. It comes in a brown sealed paper bag with a content sticker and date packed sticker with the packer's initials. The brown bag is then sealed in plastic. It was made by B.R.L. (Blundell Rules Limited) and is constructed of three disks of thin plastic with a clear plastic cursor line and metal center.

The sliderule has a diameter of approximately 5 inches.

Some of the printing on the front face:

METER READING MILLIROENTGENS PER HOUR -- TIME AFTER BURST
ACTIVITY TOLERANCES -- DILUTION FACTOR
WATER ACTIVITY MICROCURIES PER C.C. -- TIME AFTER BURST

Some of the printing on the back side:

Inter-Services Ct. No. 6665-110057

INSTRUCTIONS FOR USE
1. SET TIME AFTER BURST, disc 'A,' AGAINST DILUTION FACTOR.
2. SET CURSOR LINE AGAINST METER READING, disc 'A.'
3. TOLERANCE LEVEL OF ORIGINAL UNDILUTED SAMPLE APPEARS UNDER CURSOR LINE, disc 'B.'
4. SET TIME AFTER BURST, disc 'C', AGAINST ARROW 'T,' disc 'B."
5. SET CURSOR LINE TO METER READING, disc 'A.'
6. TOTAL WATER ACTIVITY OF ORIGINAL UNDILUTED SAMPLE IN MICROCURIES/C.C. APPEARS UNDER CURSOR LINE, disc 'C.'

ATOMIC ENERGY RESEARCH ESTABLISHMENT, HARWELL, ENGLAND
CROWN COPYRIGHT RESERVED

Made by B.R.L. Luton, England

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