240 



William Christopher Krauss 



A tape measure which seems to answer ever}^ purpose and 

 which has been cordially received by many neurologists, was 

 described by me in the Journal of Nervous and Mental 

 Diseases, 1890, page 128. It consists of a tape (i) one meter 

 long and one centimeter wide. The English scale is gradu- 

 ated on one side and the metric scale on the other. The head 

 is supplied with a swivel (3), through which passes the free 

 end of the tape, permitting of uniform tension, greater accu- 

 racy in reading, and of its being held with one hand. 



The second tape (2) is one-half meter long and one-half 

 centimeter wide, and is provided with a sliding head, through 

 which the first tape passes. This tape is, therefore, at right 

 angles to, and movable upon, the first tape. It is also gradu- 

 ated after the English and metric scales. The object of this 

 tape is to ascertain at what distance from a certain fixed, bony 

 point the first tape has been applied, so that on succeeding 

 occasions the measurement may be taken at the same point. 

 To illustrate : If the tape (i) be applied to the arm at a dis- 

 tance of .seven and one-half centimeters from the internal 

 condyle of the humerus (reckoned by means of tape 2), it is 

 obvious that on succeeding occasions, or in comparison of the 

 two extremities, the tape (i) must be applied at exactly the 

 same point, thus excluding all possible chance of error. 



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