
 A myograph is any device used to measure the force produced by a muscle when under contraction. Such a device is commonly used in myography, the study of the velocity and intensity of muscular contraction. A myograph can take several forms, including the pressure myograph, wire myograph and acceleromyograph. ...
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http://en.wikipedia.org/wiki/Myograph

instrument for recording muscular contractions
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http://phrontistery.info/m.html

• (n.) An instrument for determining and recording the different phases, as the intensity, velocity, etc., of a muscular contraction.
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http://thinkexist.com/dictionary/meaning/myograph/

(mi´o-graf) an apparatus for recording the effects of muscular contraction.
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http://www.encyclo.co.uk/local/21001
 My'o·graph  noun
My'o·graph  noun [ 
 Myo- + 
 - graph .] 
 (Physiol.) An instrument for determining and recording the different phases, as the intensity, velocity, etc., of a muscular contraction. 
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http://www.encyclo.co.uk/webster/M/123

Type: Term Pronunciation: mī′ō-graf Definitions: 1. A recording instrument by which tracings are made of muscular contractions.
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http://www.medilexicon.com/medicaldictionary.php?t=58465

an instrument for recording the contractions and relaxations of muscles.
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https://www.infoplease.com/dictionary/myograph
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