ABSTRACTS Of RECENT TECHNICAL BOOKS 183 



Reference oscillators are used in conjunction with the frequency 

 standards. They are of a type chosen for their high stability. 



The well-known properties of Lissajous' figures are reviewed briefly 

 and then are developed more fully for the cases in which only one term 

 of their ratios may be determined from the oscillograph pattern. 

 Following a general discussion of the accuracy of syntonization, there 

 is discussed a detailed method of calibrating oscillators. The patterns 

 used may be interpreted from one term of their ratio. 



Several special circuits are described for use in frequency measure- 

 ment work with the cathode ray oscillograph. 



The methods and apparatus described are suitable not only for the 

 technical measurements of a development and research nature but are 

 equally adaptable for routine commercial work. The advantages 

 which particularly commend themselves are the rapidity with which 

 such work may be done and the ease with which the average man can 

 learn the work. 



