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The double bass also differs from members of the violin family in that the shoulders are (sometimes) sloped, the back is often angled (both to allow easier access to the instrument, particularly in the upper range) and machine heads are almost always used for tuning.
The double bass bow is strung with either white or fl horsehair, or a combination of the two (known as "salt and pepper"), as opposed to the customary white horsehair used on the bows of other string instruments.
Double bass rosin is generally softer and stickier than violin rosin to allow the hair to grab the thicker strings better, but players use a wide variety of rosins that vary from quite hard (like violin rosin) to quite soft, depending on the weather, the humidity, and the skill and preference of the player.
Because the amount of spray drifting from the double nozzle (at any wind speed) was approximately double that of the coarse and the field rate was half, the total amount of AI drifting is approximately the same as for the coarse nozzle.
The dose-response curve for glyphosate through the double nozzle is very similar to that of the fine nozzle at low rates, and is intermediate between the coarse and fine nozzles at higher rates.
In a double nozzle sprayer trial using permethrin, 80% mortality was obtained at rates down to 25% and 100% mortality using label rate.
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