Re: Ambiguous Measurement Terminology

From: Tom Richards (
Date: Mon Feb 01 1999 - 20:18:15 EET

I prefer the round number of 0.001-inches, or one "HGA", which is to say
one-Half of a Gnatt's Ass.

At 09:09 AM 2/1/99 -0500, you wrote:
>-- [ From: Al Hastbacka * EMC.Ver #2.5.3 ] --
>I have noticed that went RP people talk about measurements in mils,
>there can be a great deal of confusion. The problem comes about,
>because depending on the background of the person, this can mean
>millimeters or thousandths of an inch. For example, 2 mils may be
>interpreted as two millimeters or 0.002 inches.
>In order to overcome this problem, I propose that we use a new standard.
> You have probably heard the statement that a "measurement was on within
>a gnats ass". In order to understand what this really means, I have
>examined some photographs of gnats and measured what appears to be their
>ass. From these photographs, the average value of the gnats ass came
>about to be 0.002 inches or 0.05 millimeters.
>I am therefore proposing an unambiguous measurement amongst RP'ers to be
>GA units (GA is the abbreviation for gnats ass), where a GA is 0.002
>inches or 0.05 millimeters.
>What do you think?
>Al Hastbacka
>For more information about the rp-ml, see

For more information about the rp-ml, see

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