VINTAGE HALDEN CALCULEX CIRCULAR SLIDE RULE c 1925

VINTAGE HALDEN CALCULEX CIRCULAR SLIDE RULE c 1925 (image 1/[null, null, null])
VINTAGE HALDEN CALCULEX CIRCULAR SLIDE RULE c 1925 (image 2/[null, null, null])
VINTAGE HALDEN CALCULEX CIRCULAR SLIDE RULE c 1925 (image 3/[null, null, null])
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A VINTAGE HALDENS CALCULEX CIRCULAR SLIDE RULE. DOUBLE SIDED. THE INNER DISC IS ROTATED BY THE THUMB NUT IN THE CENTER. THE CURSORS ARE MARKED ON THE GLASS FACES WHICH CAN ALSO BE ROTATED. IT IS COMPLETE WITH LEATHER WALLET AND A COPY OF REVISED RULES TABLES AND FORMULAE FOR PATENT CIRCULAR SLIDE RULE . A 94 PAGE BOOKLET WHICH IS HOUSED IN A POCKET IN THE CASE . ON ONE SIDE THERE ARE A B AND C SCALES. WHILST ON THE OTHER ARE A AND B REVERSED. THIS DEVICE IS NOT ONLY CAPABLE OF CARRYING OUT BASIC CALCULATIONS. SUCH MULTIPLICATION,DIVISION,PROPORTION,SQUARE ROOTS,CUB ROOTS, SINES OF ANGLE, BUT CAN ALSO BE USED TO PERFORM VARIOUS COMPLEX OR COMBINED CALCULATIONS MORE EASILY. FOR UNLIKE ANY OTHER SLIDE RULES , MOST OF THE BASIC CALCULATIONS CAN BE MADE WITH ONLY ONE SETTING ON THIS DUE TO THE SPECIAL ARRANGEMENT OF THE ROUNDED LOGARITHMIC SCALES. THIS SUPER VINTAGE COLLECTIBLE IS IN PERFECT CONDITION, WITH SMOOTH MOVEMENT, BEVELLED GLASS FRONT AND BACK IN GOOD ORDER.THANKS FOR TAKING THE TIME TO VIEW . I HOPE YOUR BID IS SUCCESSFUL AND YOU GET TO OWN THIS PIECE. Posted with the eBay app for Android
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