here are the two fundamental flaws of the metric system (imo).
It’s a great system that’s built upon a questionable foundation.
- It’s inflexible and unable to adapt or optimize itself per various use case scenarios.
in practice, you are basically limited to using metric at a tolerance of 1mm.
this is in contrast to imperial in which you can change tolerance on the fly depending on the scenario/scale/materials/skill/etc…
the imperial inch functions as if it’s base 16… using 16 divisions instead of 10 allows for something really interesting to happen… that being, you can continually double your precision or double your allowance. (@emilio brought this up earlier with a base16 example)
with metric, you can do this move exactly one time… if you’re working to the nearest cm, you can double your precision and switch to nearest 1/2cm… that’s it… if you want to go tighter, there’s nothing allowing for this to happen practically… you have to switch to single mm at that point which leaves you, in many situations, working at too tight of tolerance.
with the inch, you can go from 1" to 1/2"… if 1/2" is too loose then double your precision and work in quarters:
(only meaning to show the red and black lines… ignore the green&orange in these shots)
…if that’s too loose then double down and work in eights:
or again in 16ths… then 32nd… then 64ths (after this point, you’re too small to be marking/cutting by eye… but you can do it infinitely in theory)
so, with the same scale, you can work tiny or fine and you can also frame a house… while using a tolerance which complements with the scope…
(this isn’t something that’s necessarily taught in the trades… but it is something that pretty much every craftsman using imperial does… whether they recognize it or not)…
but again, with metric, you aren’t given the luxury… 5mm tolerance is too big for the majority of my scenarios… when i’m using metric, i’m using mm and only mm… the way the scale divides up, it’s also awkward to work in 1/2mm (ie- 2.5mm,3.5mm, 6.5mm and 7.5mm become a blur with each other… there’s no .25 division to assist in breaking down the left and right sides of the scale into further divisions and all the mm lines are crammed in there without obvious separations when wanting to work tighter)
with an inch, there’s no problem working in between the 16th ticks (32nds)… and a skilled builder can consistently mark 64ths if need be…
i feel i can work to a higher degree of precision (regarding my measurements and layout) using imperial… (1/32" is smaller than 1mm)… and i can do that in a more comfortable/quicker manner due to the way the inch is divided…
but when that type of precision isn’t necessary, you can’t (or don’t) switch to using 2mm increments with metric… or 4… it’s just not practical to do this in metric so even framing a house, you’re left squinting for millimeters where as the inch, you switch to 1/8 without even thinking about it.
metric works great…
…when you use it the way it works best… when you work in tenths and only tenths… and when you work at the scale of 1mm… and only 1mm.
when describing that on paper, it looks awesome… when actually using it in various scenarios, it falls apart quickly since it’s very seldom when working in tenths is optimum and there are many cases when working at 1mm is the wrong size… but again, it’s rigid and unable to adapt.
the metric system is a complete fetish_ing of the decimal system with zero regard for how decimal works in a practical manner in scenarios where measurements are needed to be used…
it worked out awesome in some dude’s mind(s) but it’s like they never actually tried using the system prior to standardizing the empire with it…
imo, the most important factor, the usability, was of (at most) secondary importance…
however, the other flaw leads me to believe usability wasn’t even secondary importance either…
- Metric size divisions are derived from a distance that’s insignificant to practically every single application it will ever be used for.
the physical size increments throughout the metric system are based off the meter being:
one-ten-millionth the distance between North Pole and the equator through Paris…
(which ended up being wrong anyway but not the point)
uh? what?
does anybody ever need to measure that or does any measurable percentage of users ever need to work at that scale?
again, just an awesome idea that sat well in someone’s mind but nothing to do with usability…
they just let the chips fall where they may and unfortunately, imo, the chips fell poorly.
the meter is too big (or too small)… the mm is too small (or too big)…
you’re left using numbers in the thousands to describe an object 7 feet long or you’re left using 1.smthng…
the meter would be better if it were 1/2 its size… or a 1/3…
or if the meter ended up being bigger during the size lottery (say, they measured from north to south pole), that might be pretty good too as the decimeter might then become a usable division instead of disregarded… the mm would be larger(allowing for more practical usage of the 1/2 mm)… having 12 divisions instead of 10 would likely help too… there would be more separation in size between mm & cm… or cm & decimeter… etc… those are crammed together too close too.
not that any of the preceding paragraph is anything but opinion… my point isn’t trying to say what the optimum size of the base length should be…
my point is, in an ultimate human numbers & measuring system… the optimum size with regards to usability would most certainly be the main consideration when determining THE base length…
deriving the very unit that all other increments will stem… from something that no one will ever need or be able to grasp practically… is a fundamental flaw.
(with all that said… i do like what happened with the gram and milliliter (though not necessarily kg and liter)… those are both good sizes for situations calling for them… of which, there are tons)
in a new system, proposed unit sizes would be trialed by many of the various end users:
mechanics, carpenters, bakers, civil engineers, etcetcetc…
mathematicians and/or other very smart people (no politicians… even if they’re smart politicians ) should ultimately be in control of creating the system… the root length as well as the numbering system.
however, much of their logic should be geared towards analysis of real people using the numbers or measurements in real situations.
that’s my main point of the whole thread… the last few thoughts.
and the image in the original post was meant to be my contribution to the trial pool if it ever were to happen… it’s the tape measure i’d like to trial in a variety of projects ranging in scale from, say, a jewelry box to a city park…
(fwiw, my idea was to make imperial’s 16th just a tiny bit bigger to further accommodate working between those ticks… what i tried first was doubling the length of a cm then dividing it into 12… and liked it immediately : )
if comparing to the two main systems today-- the ‘newUnit’ (that i personally would be interesting in trying) is a little smaller than an inch or double the size of a cm… which in turn means what we know as a cm today would be divided into 6 parts… instead of 10 (ie- the mm grows while allowing it to be further divided into tighter tolerances without changing scales)