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Duane Benson
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Re: The reverse of that
Duane Benson   7/15/2013 1:32:25 PM
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Max - re: "You certainly knew how to have fun in those days"

I'm not convinced I've improved sisnce then.

Max The Magnificent
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Re: Put the barometer away...
Max The Magnificent   7/15/2013 12:57:07 PM
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@Ron: Max, if you like parachutes then you could cradle the barometer in your arms and do the jump...

Been there... done that (three times)... now I just prefer to watch others doing it :-)

Ron Neale
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Re: Put the barometer away...
Ron Neale   7/15/2013 12:54:28 PM
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Max, if you like parachutes then you could cradle the barometer in your arms and do the jump   PS I really do know how to spell mercury.

Must huury away am watching soccer England women being beaten by Russia. Oops sorry  I mean working at home.

 

Max The Magnificent
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Re: Put the barometer away...
Max The Magnificent   7/15/2013 11:34:33 AM
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@Ron: I do like the parachute idea ... I just like parachutes :-)

Max The Magnificent
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Re: The reverse of that
Max The Magnificent   7/15/2013 11:27:03 AM
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@Duane: To keep ourselves amused while picking, we yelled back and forth between trees to collaboratively use our calculus knowledge to figure out how fast we'd be going when we hit the ground from that height.

You certainly knew how to have fun in those days :-)

Ron Neale
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Re: Put the barometer away...
Ron Neale   7/13/2013 1:02:37 PM
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Let's try again. first is it an aneroid or mecury barometer? If mecury then it will have a scale. Use that scale as the basis of developing a measuring stick or string. Then use the string to produce a 45 degree right angle triangle, along the top of a table and the height of the string. Then sight the top of the building along the hypotenuse of the triangle. Knowing the distance away from the building you can calculate the height of the tall building. If the building is very tall then it is easy to make both 45 and 60 degree triangles and use them to sight the top of the tall building. Now knowing the distance apart of the two sighting positions you can calculate the height of the building and the distance you are away from it.

If it is an aneroid barometer then make a simple parachute and drop the barometer attached to it from the top of the tall bulding. The barometer and parachute will quickly reach terminal velocity, so have a colleague a couple of floors of easily measurable distance down measure the time it takes to pass him/her and also the total time to reach the ground. The calculation of height is then trivial. This method avoids the problem of the calculation when throwing just the barometer off of the very tall building and a period of gravitational acceleration and then terminal velocity are involved.

Duane Benson
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Re: Put the barometer away...
Duane Benson   7/12/2013 6:40:30 PM
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Max re: "But that doesn't involve using the barometer, which is a key requirement for the exercise."

Convince the records office clerk that the barometer is actually a very valuable antique watch. Then bribe him or her with the watch to go right away and get the blueprints without delay, so you'll have enough time to stop at a barometer store and buy a new one on the way back to the building site.

Duane Benson
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The reverse of that
Duane Benson   7/12/2013 6:36:06 PM
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Max, re: "Drop the barometer off the top of the building, measure how long it takes to hit the ground, and use this value to calculate the height of the building."

Many long years ago, I had a summer job working in the glorious Pacific Northwest forests. Part of the job involved climbing fir trees to pick the cones, which would be used in research plantings.

One day a buddy and myself were each in old growth Douglas fir trees, up in excess of 200 feet. To keep ourselves amused while picking, we yelled back and forth between trees to collaboratively use our calculus knowledge to figure out how fast we'd be going when we hit the ground from that height.

Max The Magnificent
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Re: Put the barometer away...
Max The Magnificent   7/12/2013 1:18:20 PM
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@jmumford913: Obviously your sarcasm detector was miscalibrated...

It's not been working correctly for some time now -- I think it needs some lubrication in the form of alcohol :-)

 

Max The Magnificent
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Re: Correct use?
Max The Magnificent   7/12/2013 1:16:28 PM
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@Tom-ii: Has anyone mentioned the correct use?

Don't be silly!

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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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