is an uncommon Blundell Harling LTD. Radiac Calculator No.1 Mk. 2 Circular slide rule. Made in Weymouth, England. The slide rule measures the time from a nuclear burst. It works for either sea or land. (The two top wheels can be removed and flipped to switch between surfaces as desired.) The instructions are printed on the reverse side of the slide rule.
It is made of plastic and has a diameter of approximately 5 inches. It is in excellent condition and doesn't look like it was used very much (if at all). It comes with the original case, which is in very good condition. Both the slide rule and the case are free from any names or added markings. (Please take a look at the links to scans below, showing both the land side and the sea side.)
The winning bidder pays actual shipping. For U.S. addresses, shipping can be by USPS Priority Mail with delivery confirmation for at most $5.55. I don't charge any fees for handling or packing. (Insurance is available at actual cost at the option of the buyer.) Please check my other auctions for more slide rules and related items. Shipping can be combined at the actual cost as charged by the post office. Please feel free to email with any questions. Thanks for looking and
(For the links below, a new browser window will open. If the image still appears small in your browser, then click the small box that appears on the bottom right corner when you place your cursor over the picture.)
Please click to see a scan of the front of the slide rule (for land)
Please click to see a scan of the front of the slide rule (for sea)
Please click to see a scan of the back of the slide rule
Please click to see a scan of the case