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Jatoba

Jatoba

by Nicholas Von Robison and Debbie Suran

Originally published in American Lutherie #36, 1993 and Big Red Book of American Lutherie Volume Three, 2004



Nick: Deb, you just recently completed your 100th instrument. That’s great! Why did you choose jatoba?

Debbie: I wanted to do something special for my 100th instrument. There were times when I was starting out when I thought I’d never live long enough to get into double digits! I decided to build a hammered dulcimer (my 95th) entirely from salvaged woods. I called on friends from CompuServe’s crafts forum’s woodworking section for help, and they sent me maple flooring from an old gym for the pin blocks, birch door casings from a 1913 old-folks’ home for bracing, and the redwood bottom of a wine cask from a 19th-century California monastery for the soundboard. You can still smell the wine on a damp day! Unfortunately, I wasn’t able to find any salvaged wood nice enough for the exterior frame and bridges for the instrument, so I decided instead to use a lesser known species of wood.

In 1986 I bought some tropical woods from a couple who had lived in Brazil for several years and who were augmenting the cash income from their homestead by importing Brazilian woods that were being harvested in an ecologically sound manner. They wanted a hammered dulcimer and I wanted some wood, so we swapped. Greg had a number of woods available that I’d never seen or heard of before and was quite insistent that I give these a try. He was persuasive, so I took some Amazon rosewood (Dalbergia spruceana), one piece of macacaúba (Platimiscium ulei), and a piece of jatoba (Hymenea courbaril). Both jatoba and macacaúba qualified as lesser-known species in those days; the jatoba had more character so that made the decision. A rather roundabout way to be introduced to a new wood. How did you first stumble onto jatoba?

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Floyd

Floyd

by Nicholas von Robison

Originally published in American Lutherie #37, 1994



KERplunkit!

I reduced speed hoping the noise would go away, but no such luck. I had been traveling up US 395 from Los Angeles, and for the last half-hour I had not seen another vehicle, village, or even a gas station. Just dust, sage, and a few billboards. Then, RANDSBURG — 35 MPH. I dutifully slowed and glimpsing a hand-painted GARAGE sign, pulled over and shut her down in front of the big double doors. I squatted behind the left rear wheel and saw that the rubber bushing on the shock absorber had deteriorated and come off, so that the shock was metal-to-metal on the stud. Sensing a presence beside me, I turned, and was about six inches away from a pock-marked face with three days of salt-and-pepper stubble. He grinned — no teeth and purple gums. I caught a whiff of unwashed socks and potato skins. Another nanosecond and the potato smell registered as vodka.

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The Anti-Murphy Concert

The Anti-Murphy Concert

by Alan Carruth

Originally published in American Lutherie #39, 1994



I recently had the privilege of attending a somewhat unusual concert by the Tokyo String Quartet, with some acoustics experiments thrown in. Or maybe it was a physics lecture with live accompaniment? And then there was the quiz show part... I guess I’d better explain.

The whole thing seems to have started with the coming together of a number of good ideas. One of the first was a plan by the Acoustical Society of America to produce an educational video on acoustics for grades K–12. This, of course, would require money to do, and the suggestion was made that a benefit concert be held. The members of the Tokyo String Quartet were contacted, and graciously consented. So far, so simple.

But remember, we’re dealing with acousticians here. Why not use the opportunity to do a little research? For one thing, while the acoustics of empty halls are reasonably well understood, nobody is really sure what happens when you put in the audience. Since the object of most concert promoters is to have as large an audience as possible, and nobody likes to listen to music in an acoustically lousy hall, it seemed like a good subject for an experiment. And how about that violin thing; you know old vs. new and all? And while we’re at it...

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Wood Bibliography

Wood Bibliography

by Nicholas Von Robison

Originally published ?, 1994 and Lutherie Woods and Steel String Guitars, 1998



The literature covering trees, wood, and wood technology goes back many years. Unfortunately, much of the information one desires on a certain wood or species is scattered about in the form of articles or abstracts in obscure scientific or trade journals. What follows is an annotated listing of the major works from which gleanings in the notes or bibliographies of these will enable one to delve into the literature more fully. Many, possibly most, of these books may suffice in answering any questions one may initially have. Many are out-of-print (OOP); many are unique and have no current replacement. They may be found in libraries, used book stores, or by having a search done by a specialist bookseller. Prices change frequently so the following categories are used for those books currently in print: inexpensive (up to $10), moderate ($10–$25), expensive ($25–$50), very expensive ($50+). This list is not exhaustive, but I believe it to be fairly comprehensive and it will aid anyone who wants or needs to learn more about woods or the trees they come from. Finding some of these books is very difficult but half the fun of it.



Nomenclature Bailey, L. H. and Bailey, Ethel Zoe Hortus Second. New York, NY: Macmillan Co., 17th printing 1972.

A concise dictionary of gardening, general horticulture, and cultivated plants in North America. While this 800-or-so page book covers plants other than trees, it’s a useful reference for spelling, checking families, and looking up archaic plant names. Hortus 3rd now out. Very expensive.

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The Acoustical Characteristics of the Concert Cimbalom

The Acoustical Characteristics of the Concert Cimbalom

by Janos Pap

Originally published in American Lutherie #61, 2000



We may be surprised that the sound of the concert cimbalom, or Hungarian hammered dulcimer, is occasionally similar to that of the piano. But we can be sure that it is not a piano, only related to it. The cimbalom produces a little more nasal sound, with a rougher timbre. The acoustical differences derive from the construction of the instrument and the manner of playing. I have devoted much time to making acoustical measurements on concert cimbaloms at the Acoustic Research Laboratory of the Hungarian Academy of Sciences in an anechoic chamber, and on a cimbalom model at the Institute of Musicology at Cologne University, hoping to satisfy my curiosity about the causes and effects of the cimbalom’s sound.

In instruments of the hammered dulcimer family, the form is determined by the mode of playing. The player strikes the strings with two hammers. The strings must be divided to give a large range of notes, and the struck parts of the strings must be raised for playability. The string-dividing determines the damping features, and thus the timbre and the decay. The raising of the strings results in high downward force on the bridge, which determines the sound indirectly, by the mode of energy transport and radiation.

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