Andrews’ Pitchfork is an instrument consisting of three parallel Trend Lines. This instrument was developed by Dr. Alan Andrews.
3 条平行直线的趋势线，由安德鲁博士最先发现。
The first trend line starts in a selected extreme left point (it is an important peak or trough) and is drawn exactly between two extreme right points. This line is the "handle" of pitchfork. Then, the second and the third trend line issuing from two above-mentioned extreme right points (important peak and trough) is drawn parallel to the first one. These lines are "tines" of the pitchfork.
左边的峰谷或者峰顶发展出的趋势线是叉把，右边的临近峰值发展出叉的两个尖齿。【交易之路www.irich.com.cn收集整理】
In our discussion of Andrews Pitchforks, the terms “price pivot,” and “pivot point” will be used quite often. A pivot point is the location of a price reversal. At a pivot point, price bars change direction. When price changes from an upward to a downward direction, a “top pivot” is formed. When price changes from a downward to an upward direction, a “bottom pivot” is formed. The following chart gives examples of pivots.
Multi-Pivot lines
Standard pivot lines (or trend lines) can be drawn by connecting two pivots. However, connecting several pivots creates a multi-pivot line. When drawing a multi-pivot line, it is not necessary to run through the exact high or low of each pivot. It is only necessary to be as close to each pivot as possible. Looking for trend lines that can be drawn through a large number of pivots is important. The more pivots through which the trend line passes, the more accurate the trend line will be in predicting future support and resistance.
一大段英文就一句话：短期的极值点叫做轴心点（附近价格运动受其附近轴心影响），轴心点的连线就是我们常说的趋势线了。
The Andrews Pitchfork
Alan Andrew’s Pitchfork consists of four main lines. The first line is the only line that is not provided by the Andrews Pitchfork indicator tool. This line must be constructed by connecting two pivots that are a recent high and low of a price swing.Once the line has been constructed, move your cursor so that it is touching the line and right click. When you right click the mouse, a list of indicators will be displayed. Move your cursor so that “Andrews Pitchfork” is highlighted and left click. The Andrews Pitchfork will now appear on the screen.
选择两个轴心点（一高价轴心，一低价轴心），拉动鼠标到临近第三个轴心，安德鲁鱼叉就自动由计算机生成了。【交易之路www.irich.com.cn收集整理】
The Median Line Within the Andrews Pitchfork
The next line within the Andrews Pitchfork is the most important. This Line is the median line. The median line runs through the center of the first line, which you drew on your chart, and it determines the angle of the Andrews Pitchfork. To properly position Andrews Pitchfork, locate a third pivot that occurs before the price swing. Usually this will be the pivot immediately before the price swing, but it does not have to be. Once you have located the pivot that you will be using, move the tail end of the median line so that it touches the pivot.
三条平行线的中心那条最重要，他平分了两轴心连线的中心，决定了鱼叉的角度。
Three Median Line Trading Principals
After years of use with the pitchfork and median line, Andrews made several observations that are important for traders. These observations can be summed into three basic principals that can help a trader know what to expect when using the median line of the Andrews Pitchfork.
1. When a median line is drawn from the most recent swings, the price will return to the median line approximately 80% of the time.
2. When price returns to the median line, a pivot will usually occur.
3. When price returns to the median line, it will often make several small price swings on and around the top and bottom of the median line before continuing on.