DSP drives speed and accuracy; coherence saves the day - DSP techniques lead to faster, less costly frequency-response tests and enable the use of a powerful concept, the coherence function, which acts as a watchdog to help identify and quantify common but easy-to-miss measurement errors. Best of all, this watchdog works for free. Smart signal conditioners compensate for the errors and extract the true signals from the dross. Pressure transducers, accelerometers, temperature sensors, and linear-position sensors are often imperfect devices, prone to nonlinearities and gain and offset errors.
Lawrence THE HANDLE, which varies in length according to the height of its user, and in some cases is made by that user to his or her specifications, is like most of the other parts of the tool in that it has a name and thus a character of its own.
I call it the snath, as do most of us in the UK, though variations include the snathe, the snaithe, the snead, and the sned.
Onto the snath are attached two hand grips, adjusted for the height of the user. On the bottom of the snath is a small hole, a rubberized protector, and a metal D-ring with two hex sockets.
Into this little assemblage slides the tang of the blade. This thin crescent of steel is the fulcrum of the whole tool. From the genus blade fans out a number of ever-evolving species, each seeking out and colonizing new niches.
I also have a couple of ditch blades which, despite the name, are not used for mowing ditches in particular, but are all-purpose cutting tools that can manage anything from fine grass to tousled brambles and a bush blade, which is as thick as a billhook and can take down small trees.
These are the big mammals you can see and hear. Beneath and around them scuttle any number of harder-to-spot competitors for the summer grass, all finding their place in the ecosystem of the tool.
None of them, of course, is any use at all unless it is kept sharp, really sharp: You need to take a couple of stones out into the field with you and use them regularly—every five minutes or so—to keep the edge honed. And you need to know how to use your peening anvil, and when.
When the edge of your blade thickens with overuse and oversharpening, you need to draw the edge out by peening it—cold-forging the blade with hammer and small anvil. Probably you never master it, just as you never really master anything.
That lack of mastery, and the promise of one day reaching it, is part of the complex beauty of the tool. Etymology can be interesting. Scythe, originally rendered sithe, is an Old English word, indicating that the tool has been in use in these islands for at least a thousand years.
But archaeology pushes that date much further out; Roman scythes have been found with blades nearly two meters long. Basic, curved cutting tools for use on grass date back at least ten thousand years, to the dawn of agriculture and thus to the dawn of civilizations. Like the tool, the word, too, has older origins.
The Proto-Indo-European root of scythe is the word sek, meaning to cut, or to divide. Sek is also the root word of sickle, saw, schism, sex, and science. Some books do that, from time to time, and this is beginning to shape up as one of them. By his own admission, his arguments are not new.One of the common features of an epic is the "fabulous loci" for the hero to visit.
Fantasy novels can have some loci that are quite pretty or terrifying, but science . Paul Kingsnorth is a writer and poet living in Cumbria, England.
He is the author of several books, including the poetry collection Kidland and his fictional debut The Wake, winner of the Gordon Burn Prize and the Bookseller Book of the Year Award.
Kingsnorth is the cofounder and director of the Dark Mountain Project, a network of writers, artists, and thinkers. We humans are far more complex than the news headlines and clickbait would have you believe.
Let the Narratively newsletter be your guide. For some good general notes on designing spacecraft in general, read Rick Robinson's Rocketpunk Manifesto essay on Spaceship Design Also worth reading are Rick's essays on constructing things in space and the price of a spaceship.
For some good general notes on making a fusion powered spacecraft, you might want to read Application of Recommended Design . Log into Facebook to start sharing and connecting with your friends, family, and people you know.
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