[jamaksin]

Um ... plastic slip-stick, good. But not a Log Log Duplex Decitrig (aka 4081) - engraved scales.

Of course, the DeciLon is also plastic - four matched Log-Log scales, with added Sq1/Sq2 scales.

Now, extend that with three cube scales, L/Ln (Dual Base) of Pickett's N3 (N4 has hyperbolics. but Log-Log scales are base 10) - done in metal ...

Tie those to a couple of 12AU7's and those glow on the dark.

[867V309]

I had a Log Log Duplex Decitrig which was stolen, replaced it with the Jet Log which had a few more scales.