496 DR. C. CHREE, EXPERIMENTS ON ANEROID BAROMETERS 



TABLE XL VI. Creep Ratios, calculated from data on Mr. WHYMPER'S p. 19. 



The mean value for q, viz., '234, is considerably higher than that given in 

 Table XLV. There is also at least a suggestion that the first two weeks' creep 

 was, relatively speaking, somewhat greater than according to the single term law. 



51. The last and much the most varied set of data which I have utilised are 

 taken from tables on Mr. WHYMPER'S pp. 26, 27, and 28. The table on p. 26 has 

 been already described. That on p. 27 gives with some blanks the errors at the end 

 of the 1st, 2nd, 4th, and 7th days' exposure in 21 of the 29 aneroids included on 

 p. 26. The table on p. 28 gives the errors at the end of the first hour, and the end 

 of the first day, in all the 29 aneroids. Though not apparently mentioned, it is 

 clear, from the size of the errors specified at the end of the first day, that the three 

 tables refer to the same experiments. I have thus dealt with them together. The 

 results of my calculations are given in Table XLVII. for all the aneroids for which 

 complete sets of readings are given, with the exception of one, of which a reading is 

 queried by Mr. WHYMPER. In the case of the 5 lowest pressures in the table, the 

 results are means for the 2 or 3 aneroids exposed to the same pressure. 



TABLE XLVII. Creep Ratios, calculated from data on Mr. WHYMPER'S 



pp. 26, 27, 28. 



The aneroid exposed to the pressure of 24 inches is one of the two exceptional 

 ones already referred to. The mean values in the last two lines of the table are 

 obtained by omitting it. 



