Monthly Archives: September 2021

≡  Whenever I ask Alexa, set a timer for 5 minutes (typically when I am grilling burgers), I’m always surprised how quickly those few minutes pass.  It’s like, wow, already?  I hardly had time to sit down, and now you’re telling me those minutes are gone.  Good thing Alexa is not sitting on our shoulders, timing what remains of our lives.

≡  If you were to live on Wild Magnolia Way near Zirconia, North Carolina — specifically at the coordinates 35.1653N, 82.4559W — you could walk 1300 feet north, 1300 feet south, 1300 feet east, or 1300 feet west, and in each case, for better or worse, you would wind up in South Carolina.  (OK.  It would be worse.  Sorry, not really, South Carolina.)

≡  By the way, the previous “thought” took me over an hour to research.  Good thing Alexa was not sitting on my shoulder, timing how much of my life ticked past on that exercise.

≡  In Being a Ballerina: The Power and Perfection of a Dancing Life, Gavin Larsen writes: “The curse of being a good faker is that people begin to think you’re for real, and then they expect things.”  For many, the next step along this path is self-deprecation, our indirect way of saying, “Please don’t expect anything more of me than I expect of myself.”

≡  The reverse side of this coin is impostor syndrome: they expected things of me, and those things were delivered, so they judged me to be competent even though the outcome was uncertain and only partly due to my effort.  I got more credit than I deserved for the fortune of working with good people.  Damn expectations, the curse of transactional life.

≡  I was just notified that MailChimp, the (free-to-me) service I use to send update notices to my subscribers, is selling itself to Intuit, owner of TurboTax and QuickBooks.  Somehow I will not be surprised the day I’m told that I will have to pay for the privilege of letting you know something new has been posted here.  As always, money marches on.

≡  Here’s a good one.  I’m always impatient to have my first cup of coffee after I wake up.  Last night, to speed up the process, I decided I would pre-fill the carafe with water and put the filter in the coffee-maker basket so that I wouldn’t have to fumble around with those tasks in the morning.  All I would have to do is grind the coffee, dump it into the basket, empty the carafe into the reservoir, and turn on the machine.  So fast-forward to this morning.  I go through the motions of making coffee and then sit down in the family room to wait, and voilà!  I’m amazed how fast the coffee-maker beeps to let me know my coffee is ready!  I go back out to the kitchen to find cool, clear water sitting in the carafe.

≡  The world would be a happier place if people didn’t get so bent out of shape when their expectations were not met.  When exactly did perfectionism become not only a thing but an entitlement?

≡  There needs to be a set of words for forms of government that are distinguished by the fact that men define them and control them.  For example, theomanocracy is the kind of government you find in places like Iran, Saudi Arabia and Vatican City.  And then there is demomanocracy, whose most notable example is the U.S.A. — the 88th-ranked nation in terms of women’s participation in congress/parliament (23%).  But let’s not forget about commumanism as practiced in the People’s Republic of China — there is only one woman in their 25-member Politburo and no women at all in their 7-member leadership circle.

≡  If you are looking a word for forms of government distinguished by the fact that women define them and control them, then I can supply it — none-ocracies.

≡  I was rear-ended at an on-ramp in early June.  My vehicle had under 4000 miles on it, thus ended my new-car honeymoon.  The parts to complete the repair took two months to arrive, so the work was just finished this week.  Since the crash, I have become paranoid about other vehicles ramming into me from behind — I find myself constantly checking my rear-view mirror for drivers talking on their phones who don’t care about attention spans or stopping distances.  What am I supposed to do about them?  It signifies a huge loss of social trust when drivers are forced to manage the space behind them as carefully as the space ahead.

≡  Not long ago, my spouse noticed a highly-agitated person in the parking lot of our local supermarket, talking to himself.  She was concerned about his well-being (as well as those he might encounter) but she did not know who to call so he might get help.  After hearing her story, I was compelled to look into this — who would I call?  How would they respond?  There is no clear answer to either question, at least in these parts.  What about in yours?  This topic is much more than a “thought” and will be taken up again in a future post.

≡  Handbook of Western Culture Rule No. 118:  “No performer in a blues song, rap song or action movie shall say whom or isn’t.  [The preferred forms are who and ain’t.]  Moreover,  those who observe Rule No. 118 are considered to have adhered to Western Cultural norms and thus shall not be held in breach of conflicting linguistic rules in this Handbook.”

≡  Our not-so-local (Saga) “pure oldies” station often plays “Ferry Cross the Mersey” by the British band Gerry and the Pacemakers and written by the band’s leader Gerry Marsden.  “Mersey” refers to the River Mersey that divides the cities of Liverpool and Birkenhead, Liverpool’s poorer cousin.  Since I usually listen to oldies on my portable radio when I do outdoor projects — and since Saga has a rather limited rotation — I have probably heard “Ferry Cross the Mersey” ten times as much in my sixties than I ever did in the sixties.

I single out “Ferry Cross the Mersey” because, when I actually listened to the song, I was intrigued by the lyrics:  People around every corner / They seem to smile and say / We don’t care what your name is, boy / We’ll never send you away…

Where did this come from?  The song was about crossing an English river, for godsake!  Marsden makes it sound like his ferry transported him to a foreign and hostile land, only to be taken aback when the townfolk of Birkenhead didn’t spit on him and throw him into the stockade.*

But upon further review, I thought… rivers, walls, trenches, hollers, streets, railroads, Mason-Dixon lines… any boundary at all can serve as a way to separate us from them.  Maybe Gerry — and his ferry — were onto something.

___________
* The north side (Liverpool) and the south side (Birkenhead) of the Mersey had been in different counties (Lancashire and Cheshire, respectively) for 783 years when Marsden wrote his song.
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Asked and Answered 3.4

Hello, and here we are again.  I thought I was done with this series on hanging pictures, but it seems physics never dies — it just gets more complicated.

Some commenters on my previous articles (Why Frames Tilt Forward, The “Hang It with Two Hooks” Calculator, and The Physics of Hanging Pictures) asked how they could hang items on wall studs, if the studs are off-center from the desired hanging spot.  This seemed to be a rather specialized topic, and beyond the scope of my series, so I deferred until now.  But a recent commenter rekindled my interest and finally inspired me to take a look.

Before I proceed, however, I must mention that I’m not the first to address this problem.  The number-one result (as of now) I found in searches for “hang item on off-center studs” is this article on instructables.com by an author named MolecularD.  The author describes the principles involved and offers a set of equations (minus the math) that are meant to show the reader where to place the wall hooks.  Unfortunately, some readers commented that they did not get the desired result when they followed the author’s instructions.

The solution provided in the inscrutables.com article is such a complicated equation that there is no way for me to verify it without essentially solving the problem myself.  Which is what I will do now, taking a somewhat simpler, more intuitive approach.

The four consecutive views in Figure 1 demonstrate the concept:

FIGURE 1: THE CONCEPT
Concept of Hanging a Frame on Two Studs

View (A) depicts a frame hanging on a wall, centered at our desired position (dotted line), using a wire on a single hook.  Because of the symmetry of the system, there is no tendency for the frame to rotate one way or the other.  Ignore for now the fact that the wire extends above the top of the frame.

View (B) shows the studs in the wall behind the frame (we use a stud-finder to spot them).  The two studs are different distances from the center of the frame.  We drive a nail into the center of each stud, just touching the underside of the wire.  This does not cause the frame to rotate.

In View (C), we attach a piece of wire (blue) to the original wire, from the point where the first nail touches the wire to where the second nail touches the wire, without any slack.  The load is now shared between the central hook and the nails in the studs.  But this still does not cause the frame to rotate.

In View (D), we snip away the original wire where it touched the nails, leaving our new wire in place.  The nails in the studs now assume all the load, with the higher nail bearing more than the lower.  Still the frame does not rotate, so we have found the solution.

Obviously, I don’t expect readers to repeat these steps to hang their pictures — this was just a demonstration of concept.  Instead I will offer a calculator, with instructions for taking measurements, placing the hooks and cutting the wire, to help the reader achieve the final result.

That is, if you really insist on using studs.  Personally, I think it would be easier in most cases to forget about the studs and use the Hang-It-With-Two-Hooks calculator that I presented in my earlier article.  You would fasten the hooks to the wall with toggle bolts, which can hold a significant amount of weight when paired with the appropriate hooks.  (This video shows how to install them.)  But in the end, it’s your call.

The Setup

Oh, you’re still here!  This must mean that you really, really want to use two studs to hang your item.  Okay then, onto the intricate details.  Please consult Figure 2 (below) to get a sense of the important lengths and measures:

FIGURE 2: USING TWO STUDS TO HANG A PICTURE
Diagram of Frame Hung on Two Studs

Start by measuring the height H and the weight of the item you want to hang.  Then mark the spot 0n the wall corresponding to the top-center of the item.  All other measurements will refer to this point.

Next, use your stud-finder to measure XA, the distance from top-center to the center of the closest stud, and XB, the distance from top-center to the center of the next-closest stud.

Now inspect your hanging hardware.  You want to (ideally) hide all your hardware behind the item you are hanging, which means the higher hook (A) should not show.  Therefore, you should choose a value for ZA, the distance from the top of the frame to the bottom of Hook A, that is slightly greater than the length of the hook.

While you are it, measure the length (D) of the D-rings attached to the item.  If you plan to attach the wire directly to the item, then this length is zero.

Your next measurement is WD, the distance between the D-ring attachment points.  If you have not yet attached the D-rings to your item, then mark the spots where you think they should be attached, and measure the distance between those marks.

Note that I have not asked you to specify Y, the distance from the top of the frame to the D-ring attachment point, or ZB, the distance from the top of the frame to the bottom of Hook B, or S, the length of wire to cut.  These values will be returned by the calculator.

There is one last thing you may have noticed on the diagram: to make the item hang true, you need to install a guide hook below Hook A to equalize the slack in the wire — and the forward tilt — on the left and right sides.  More on this later.

The Math and The Calculator

I provide geometric and algebraic solutions in this attachment.  The result we are most interested in is:

ZB = ZA+ (XBXA) tan θ

where θ is the wire angle, tan θ = (Y ZA)/(WC XA) and WC = ½ WD.

The formula for ZB assumes that Y, the D-ring attachment point, is a given.  But I don’t ask you to specify Y directly, as this involves a judgment call.  Ideally, the ratio Y/H would be about 1/5 (the “one-fifth rule”) to minimize forward tilt of the item.  But this might call for too small a wire angle and create too much tension in the wire.  On the other hand, if the  wire angle is too large, and Y/H is greater than 1/3, then the forward tilt could be excessive.

So what I did in the calculator is ask you to specify the wire angle, with 30° as the default. (The minimum entry is 20° and the maximum is the angle corresponding to Y/H = 1/3.) The wire angle is used to back-calculate Y as described in the attachment.

If the default angle seems to provide a reasonable value for Y/H, then go ahead with it, assuming the wire tension is not too high.

If the calculator flags one of your entries as out-of-bounds, don’t ignore it.  The calculator will not report any results if Y/H is greater than 1/3, and it will warn you if the estimated wire tension exceeds 25 lbs.  (You are responsible for selecting the appropriate hardware.)

Results are reported to the nearest one-eighth-inch.   The calculator provides guidance on positioning the guide hook and attaching the wire to the D-rings.  The suggested length of wire S includes 6 extra inches (3 inches per side) for tying the loose ends to the D-rings.

Final Notes

It may be a challenge to hang your item on three hooks.  I suggest you find a helper, if only for you to have someone to complain to while attempting it.  (Still, watch your language.)  You might start by feeding the slack of the wire through the guide hook and onto Hook A.  Then slide the item toward Hook B and feed the wire over Hook B.

You ask, do I have to use the guide hook?  If your item weighs much of anything, then yes.  The farther that Hook B is from the center, the more the item will tilt forward at Hook A,  since there is more slack in the wire on that side.  And the more front-heavy the item, the more uneven the forward tilt will be.  The guide hook helps keep the wire close to the wall on the Hook A side.

I end with my usual disclaimer.  My calculator makes it easier for a person to hang an item on two off-center studs using hooks and wire.  But whether this method is suitable in your situation is a judgment only you can make.  You assume full responsibility for your project. I offer this calculator as a convenience, but I accept no liability for damage of any kind, even if the suggestions offered in this post are followed exactly.

If you’re not confident how things are going to work out, you can always do a mock-up in your garage before you mark up your walls.

With that out of the way, good luck.  I would be interested to hear about any successes, failures or problems.  As always, your suggestions and feedback are welcome.

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Science fact: In the Northern Hemisphere, clothes hangers are made to point to the left

But in the Southern Hemisphere, clothes hangers are made to hang to the right

That explains why the best international hotels provide clothes hangers without hooks

And you don’t even have to go to The Equator to find them.

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