Bow-Arm Box Details
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Hi, ARC!  Glad to work with you again!
When the bow is placed on the strings, the Bow is parallel to the upper arm, the area from the Shoulder to the Elbow. 
My pleasure!
Shoulder Arc
The primary purpose of the bow-arm’s shoulder is to arc your arm to the correct level of the strings.
The Shoulder Arc is the main lever of the Bow-Arm Box.
IMPORTANT: When bowing, the shoulder never lifts upwards towards your ear.
The only function the shoulder performs when bowing, is to float your bow-arm to the proper height, giving power to your playing.
On the next page, V will be assisting in diagrams. As a team, we will display the proper Shoulder Arc levels that provide leverage.
Each individual string has a corresponding upper arm bow position.
As you know, whenever V is teaching, his presence serves as a reminder to always include leverage in your playing motions. Let’s go!
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ARC, please kindly share your Shoulder Arc expert knowledge. 
Introducing the Bow     Parts of the Bow     The Stick     Horse-Hair     The Tip     The Frog     The Winding     How the Bow Works 
 Rosin     Preparing to Hold the Bow     Stick Training Exercises     Bowing Terminology     Down-Bow     Up-Bow     

Bow-Hand Set-Up    Finger Tasks and Functions     The Thumb     Meet ARC     Finger Segments     The Index-Finger   
Bow-Hand Pronation      The Center-Finger and Ring-Finger     Bow-Hand Fulcrum     Ring-Finger Propulsion     Bass Bows 
 Pinky Bow-Tasks     ‘Casting’ the Bow-Hand    Bow-Wrist Tasks    Rotational Inertia    Arco    Clay Smile Exercise    Meet ANGLE 

The Bow-Arm Box     The Shoulder Arc     Bow Contact-Point     String Lanes     Bow-Segment Mastery     Bowing Exercises 

Finding the Bow Contact-Point     “Painting With Sound”     Bowing Exercises Menu     Bow Taps     Bowing Traditions 

Perform Down-Bows     Perform Up-Bows     The Art of the Bow-Change     Articulations     Staccato     Legato 

Mastery Checkpoint One     Building Bow Control     Bow Speed and Bow-Arm Motion     Bow Planning and Distribution

Slow Moving Bow Strokes     Individual Bow Segments     Traveling the Bow     Bowing Dynamics     Mastery Checkpoint Two 

Advanced Techniques     Slurs and Articulations     Slur Training     Locating the Bow’s Balance Point     Ricochet and Spiccato 

Exploring Ricochet     Ricochet Control     Spiccato Training     Spiccato Control     Spiccato Brush Strokes 

Multiple String Crossings     Virtuosic Bow Strokes     Arpeggio Bowing     “Flying” Staccato     Mastery Checkpoint Three 

SCROLL’s List of Bow Strokes