Road rules2 mins ago
1/20Th Inch Markings On Ruler
I've got an engineer's 12 inch steel rule that has each inch divided up into 1/20th of an inch graduated divisions. Who would need to use such a scale? I do remember using wood rulers at school many years ago that had tenth of an inch divisions marked on it and I never managed to fathom out who would use them either!
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People in engineering might appreciate this one:
Two guys in the dole queue get chatting. One says, "I lost my job as a fitter and turner because I was six thou out". Second one says, " I lost my job because I was two thou out". First one says,"Only two thou, that's a bit harsh! What was your job?" Second one says, "Club steward".
Two guys in the dole queue get chatting. One says, "I lost my job as a fitter and turner because I was six thou out". Second one says, " I lost my job because I was two thou out". First one says,"Only two thou, that's a bit harsh! What was your job?" Second one says, "Club steward".
In the science, if that's the correct term, of measurement there are all kinds of weird and wonderful systems. Take, for example, the sizing of pocket watches: "Watch movements are measured in an arcane English system of measurement called the Lancashire system or Lancashire Gauge**. In this system, 1 5/30th inches is the "base" measurement and is called 0-size. Each 1/30th of an inch adds 1 (or subtracts 1) to this base. A watch is measured through the center of the lower plate of the movement (the dial side). If the movement is asymmetrical, say oval or rectangular, it is measured at its narrowest point. Note that the case is NOT included in this measurement, only the movement. Measuring the dial is usually a fair approximation of the lower plate measurement."
Here is something else regarding watchmaker's measurements, and also a reference to the OP's question.
"Watchmakers' use
The ligne is still used by French and Swiss watchmakers
There are 12 lignes to one French inch (pouce). The standardized conversion for a ligne is 2.2558291 mm (1 mm = 0.443296 ligne), and it is abbreviated with the letter L or represented by the triple prime, ‴. One ligne is the equivalent 0.0888 inch.
This is comparable in size to the British measurement called "line" (one-twelfth of an English inch), used prior to 1824.[2]"
"Watchmakers' use
The ligne is still used by French and Swiss watchmakers
There are 12 lignes to one French inch (pouce). The standardized conversion for a ligne is 2.2558291 mm (1 mm = 0.443296 ligne), and it is abbreviated with the letter L or represented by the triple prime, ‴. One ligne is the equivalent 0.0888 inch.
This is comparable in size to the British measurement called "line" (one-twelfth of an English inch), used prior to 1824.[2]"
I use a micrometer every day, very useful tool indeed ( well it is in engineering ).
Obiter
People in engineering might appreciate this one:
Two guys in the dole queue get chatting. One says, "I lost my job as a fitter and turner because I was six thou out". Second one says, " I lost my job because I was two thou out". First one says,"Only two thou, that's a bit harsh! What was your job?" Second one says, "Club steward".
LOL, like it., Obiter.
Obiter
People in engineering might appreciate this one:
Two guys in the dole queue get chatting. One says, "I lost my job as a fitter and turner because I was six thou out". Second one says, " I lost my job because I was two thou out". First one says,"Only two thou, that's a bit harsh! What was your job?" Second one says, "Club steward".
LOL, like it., Obiter.
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