CALCULATION OF THE AREA OF CIRCLE 1. Rotate the black knob to position the "C" under the fixed indicator. 2. Rotate the red knob to position the Needle over the Diameter(D=2xRadius). 3. Rotate the black knob to position the Index under the fixed indicator. 4. Under the Needle read the area of the circle on the outer scale.
I bought one of these on ebay, just as a 'nerd toy,' and then was fully disgusted when I realized they should have never stopped teaching trig and analytical geo with these... ugh... Definitely makes the 'numbers' make more sense.
It is Awesome!!! how you flip from front to back. Two points: - My KL-1 is not aligned, setting the fixed index to 1, and the needle to 2, the inverse reads 4.9 not 5.0. How do I calibrate it? I did not want to bend the needle, I opened the bezel and the fixed needle is soldered to the frame, and both faces are glued to the frame... There has to be a way to adjust it to account for manufacturing errors.... any ideas?? - I could not figure out how to concatenate several multiplications.. until I changed the order... 1) set the fixed index to the first multiplicand, then move the needle to 1, then rotate the bezel until the needle is on the second multiplicand, then the answer is on the fixed indicator. Then to multiply the result by another number, move the needle to one, then rotate the bezel by the new number and the new result is again under the fixed indicator.
Thanks! I've never tried an adjustment on a KL-1. They don't really seem designed to be adjustable. If I really needed it done I might check with someone who services mechanical watches. My guess is the needle should be removed then reattached in correct alignment.
Great video. I picked one up on eBay that’s near new condition. It’s got a really nice movement. Any idea how widely these were used? I had never heard of them until I saw your video. Also, this might be a stupid question, but do you know what the “C” mark near 1.125 is. I was thinking c as in speed of light, but that doesn’t work since, as I recall that’s either 300 or 186, and I can’t think of physical constant at that value. Just curious. I’ve never seen that mark on any other slide rules.
Good question! I have a Polish slide rule with these markings as well: c (1.113), c1 (3.57), ♀' (3.439) and ♀'' (2.065). The last two I'm not sure, they look more like an upside down δ, but I couldn't find the exact symbol.
If your descriptions are correct, the first would be useful in relating the diameter and area of a circle. The two rho constants would be useful for radian/degree conversion. The c1 constant sounds similar to to the c constant, but with the decimal point moved (40 instead of 4). My guess is that this has to do with how it is used with the square scale (i.e. how many digits your number has) since that is an issue when finding square roots, but I don't have a slide rule handy.
Hi, I watched another video there where a guy said you could do trig on the slide rule on some watches,doing a google I couldn't find out how, but your video is the closest I found. Can you help me figure out how a watch slide rule can be used for this and or which type of watch slide rules I should be looking at. Honestly I haven't done trig for so long fully, and use a triangle calculator on my mhone these days, but I would love to be able to do this on my wrist for use when I am camping and out and about without my phone. As I do actually use it fairly often. Thank you
I'm not very familiar with watch slide rules, but I think the basic ones (like described here: www.ablogtowatch.com/how-to-use-a-watch-bezel-slide-rule/ ) do not have the trigonometric scales (S and T).
Thank you for the very helpful response, You ahve at least confirmed there is a trig scale of some sort, now I just have to bring it back into fashion. As much as I loved the 90's calc watches, I prefer the more refined look and the function of a chrono with at least the tachy scale. I will start asking some watch forums about custom bezels and try and track down a custom maker or something. Thank you again.
@@8thsinner Maybe it's too late, but the way I got interested in slide rules was through his Breitling Chronospace A56012 which has a slide rule on the bezel. Actually they are a C scale and CI scale, so it's sufficient to align the two numbers to read the result under the indicator. Hope this helps you.
CALCULATION OF THE AREA OF CIRCLE
1. Rotate the black knob to position the "C" under the fixed indicator.
2. Rotate the red knob to position the Needle over the Diameter(D=2xRadius).
3. Rotate the black knob to position the Index under the fixed indicator.
4. Under the Needle read the area of the circle on the outer scale.
I bought one of these on ebay, just as a 'nerd toy,' and then was fully disgusted when I realized they should have never stopped teaching trig and analytical geo with these... ugh... Definitely makes the 'numbers' make more sense.
Thanks. My father had one of these when i was a kid. I always wondered how it worked. I got one and I'll be practicing with it.
I like slide rules, though I'm not good at maths. It was fun watching all of your videos. Thank you professor!
It is Awesome!!! how you flip from front to back. Two points:
- My KL-1 is not aligned, setting the fixed index to 1, and the needle to 2, the inverse reads 4.9 not 5.0. How do I calibrate it? I did not want to bend the needle, I opened the bezel and the fixed needle is soldered to the frame, and both faces are glued to the frame... There has to be a way to adjust it to account for manufacturing errors.... any ideas??
- I could not figure out how to concatenate several multiplications.. until I changed the order... 1) set the fixed index to the first multiplicand, then move the needle to 1, then rotate the bezel until the needle is on the second multiplicand, then the answer is on the fixed indicator. Then to multiply the result by another number, move the needle to one, then rotate the bezel by the new number and the new result is again under the fixed indicator.
Thanks! I've never tried an adjustment on a KL-1. They don't really seem designed to be adjustable. If I really needed it done I might check with someone who services mechanical watches. My guess is the needle should be removed then reattached in correct alignment.
Great video. I picked one up on eBay that’s near new condition. It’s got a really nice movement. Any idea how widely these were used? I had never heard of them until I saw your video. Also, this might be a stupid question, but do you know what the “C” mark near 1.125 is. I was thinking c as in speed of light, but that doesn’t work since, as I recall that’s either 300 or 186, and I can’t think of physical constant at that value. Just curious. I’ve never seen that mark on any other slide rules.
Thanks Tim! I'm not sure about the gauge mark off the bat, but it's made me curious enough to look into it when I get back from vacation!
The C mark is used to calculate the area of a circle using the diameter. It is equal to sqrt(4/pi) = 1.128.
Good question! I have a Polish slide rule with these markings as well: c (1.113), c1 (3.57), ♀' (3.439) and ♀'' (2.065). The last two I'm not sure, they look more like an upside down δ, but I couldn't find the exact symbol.
I found the answer: c=sqrt(4/π), c1=sqrt(40/π), ρ' and ρ'' are the number of minutes and seconds in 1 radian. What's so special about those constants?
If your descriptions are correct, the first would be useful in relating the diameter and area of a circle. The two rho constants would be useful for radian/degree conversion. The c1 constant sounds similar to to the c constant, but with the decimal point moved (40 instead of 4). My guess is that this has to do with how it is used with the square scale (i.e. how many digits your number has) since that is an issue when finding square roots, but I don't have a slide rule handy.
Hi, I watched another video there where a guy said you could do trig on the slide rule on some watches,doing a google I couldn't find out how, but your video is the closest I found.
Can you help me figure out how a watch slide rule can be used for this and or which type of watch slide rules I should be looking at.
Honestly I haven't done trig for so long fully, and use a triangle calculator on my mhone these days, but I would love to be able to do this on my wrist for use when I am camping and out and about without my phone. As I do actually use it fairly often.
Thank you
I'm not very familiar with watch slide rules, but I think the basic ones (like described here: www.ablogtowatch.com/how-to-use-a-watch-bezel-slide-rule/ ) do not have the trigonometric scales (S and T).
A calculator watch with sine / cosine / tangent would also do the trick: home.earthlink.net/~kdstaller/KScasio.html
Thank you for the very helpful response, You ahve at least confirmed there is a trig scale of some sort, now I just have to bring it back into fashion.
As much as I loved the 90's calc watches, I prefer the more refined look and the function of a chrono with at least the tachy scale.
I will start asking some watch forums about custom bezels and try and track down a custom maker or something.
Thank you again.
@@8thsinner Maybe it's too late, but the way I got interested in slide rules was through his Breitling Chronospace A56012 which has a slide rule on the bezel. Actually they are a C scale and CI scale, so it's sufficient to align the two numbers to read the result under the indicator. Hope this helps you.