Hi, Tony

I don't know about other guys, but rarely do I consider
the numerical size of a hex wrench, just try the next larger or smaller
one in an index. The smaller ones aren't even labeled.

What makes my head hurt was the British coinage before decimalization:
12 pence in a shilling, 20 shillings in a pound.
With coins like florins (2 shillings), crown (5 shillings),
half-crown (2 shillings and 6 pence), farthing (1/4 pence),
etc. Then there was the Guinea of 21 shillings:
a professional would bill you in Guineas
for his services.

I guess the only residue of that system is that kids
here in the States still memorize math tables
up thru 12 x 12. That may be a holdover from the 12 pence per shilling
days.

73,
Ed Knobloch

Antonio Vernucci wrote:
It is a 3/64" hex wrench on my HRO-50,
I assume unchanged on your HRO-60.

73,
Ed Knobloch

Hi Ed,

just a curiosity.

In Europe the hex wrench and spanner size varies in increments of 0.5 mm
(a little more than 1/64"). We then have wrenches of 0.5, 1.0, 1.5, 2.0,
.... Very easy.

In the US, instead of always expressing size as multiples of 1/64" (that
is 1/64", 2/64", 3/64", 4/64", 5/64" ...), when possible you simplify
the fraction (that is 2/64" -- 1/32", or 16/64" -- 1/4"). I wonder
whether the average AmerIcan, not necessarily well accustomed to play
with fractions, can instantly determine that, if e.g. a 17/32" spanner
is too big, he should try a 33/64" spanner before taking a 1/2" spanner.

73

Tony I0JX, Rome Italy