Graphoplex Roplex Circular Slide Rule. 10 Scales. Unusual Mechanism.France.Fine.

Description

Graphoplex Roplex Circular Slide Rule.
10 Scales - - 5 each side.
5 -1/8" (128 mm) diameter. ¼" (6 mm) thick.
Metal and plastic.
Duplex.
France.
Has a unique mechanism for operating the scales and cursor.
A knurled metal wheel on one corner moves the scales ("Echelle")
and a second wheel on another corner moves the cursor ("Curseur").
A very fine piece of machinery.
The mechanism is so unique that, to my knowledge, no other slide rule
maker duplicated it.
Rule is in excellent condition.
Operates smoothly.
Original textured cardboard case is in good condition.
The Roplex slide rule is scarce and seldom seen.
Payment is due via PayPal within 3 days from end of auction.
Buyer pays .70 shipping to USA address
via First Class Package.