brevity in Tables 2 and is explained in Table 1. 3 ‘Yable il contains the information obtained from the standard gain recordings and Table 3 lists tne proton intensities found from the hish sain (4%) recordings. Secause of the increase in resolving power some lines which were unanalyzable or undetectable on the standard gain records became analyzable on tne nish cain records. The data have been left in tabular form to make the information more readily accessible to those who wish to use it. ERRORS . oC In actual practice tne analysis is more difficult than might be assumed from tne description in the Analysis of Data section for the following reasons: (1) The snape of the Compton distribution is known only approximately for a given energy even thouzh its area is known fairly accurately. were accurately Known, Even if the snape it would be mechanically diffi- cult to draw such a distribution in with a predetermined area. For tnis reason a straight line is used for the Compton distribution, with the resulting rectansle having the proper area, It is found, however, after drawing in this rectangular representation of the Compton distribu- tion several times and getting the "feel" of the machine, that the base line for each succeeding peak _@stimated with similar can be accuracy 21 +

Select target paragraph3