Cogito Jun 2021

I am; therefore I calculate.
A chronology of calculating devices.
★★★★★

#2 Pencil
★★★★★

K&E 4081-3 Log Log Duplex Decitrig Slide Rule (front)
I used this till August 1975
★★★★★

K&E 4081-3 Log Log Duplex Decitrig Slide Rule (side)

Dietzgen 1778 Slide Rule
★★★★★

Concise Circular Slide Rule 28N (front)
★★★★★

Concise Circular Slide Rule 28N (back)

HP-25
★★★★★

HP-41CV
★★★★★

HP-9845
★★★★★

HP-28
☓☓

HP-32S
★★★★★

HP-35S
★★

Calc98 for PC
★★★★★

MathU RPN
★★★★★

Pentel P207 0.7mm with HB lead
Pentel ZE22 Clic Eraser
★★★★★★★★★★

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