Tuesday, April 4, 2023

April Haul

 The mathematical tools purchased in April so far...


From the Pasadena City College Swap Meet:


A 27-slot soroban abacus, the longest abacus that I have ever seen..



A 5 inch Frederick Post Co. No. 1444K slide rule.



Online:

Sharp EL-506TS (review to come soon)


Casio fx-991CW: (See review here:  http://edspi31415.blogspot.com/2023/04/review-casio-fx-991cw.html




Eddie


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