Xvi REPORT — 1869. 



Central Ohse^'vatory (Assistant). 



(8.) The assistant at Kew shall examine each curve in order to see if 

 there is any want of light or appearance of bagging, or of finger- 

 marks, or of bad photography, and he shall occasionally see that 

 the temperature bar is in proper action. 



(9.) He shall see that the clock and clock-stop have been in good action 

 for the time of the curve. 



(10.) That the instrumental clock docs not differ more than two minutes 

 from the chronometer as recorded on the curve. 



(11.) That the date written on the back of the curve agrees with that on 

 the face. 



(12.) That the curve is properly written upon after the pattern. 



(13.) That in the Barograph Journal the proper day of the month is placed 

 alongside of Sunday, and that the otliers follow conseciitively. 



(14.) That the times of starting and stopping the curve as recorded in the 

 journal have been properly recorded on the face of the curve. 



(15.) Finally, he shall ascertain, by means of a simple inspection of the 

 curve, that the beginning and ending, as shown by the curve itself, 

 are the same as those described on the face of the curve. 



(IG.) He shaU sec that the journal readings of the Standard Barometer 

 are entered under their proper dates into the Barograph tabulation 

 sheets. 



(17.) Then examine in a general manner the accordance of the Barograph 

 and Standard readings for each day. If these two tests be satis- 

 factory, he may conclude that the tabulations and Standard read- 

 ings have both been entered under their proper dates. 



(18.) Check the accuracy of the subtractions made in the tables of siib- 

 sidiary measurements furnished by the outlying observatory. 



(19.) Investigate all cases where A — B is greater than -02 in. ; if an error 

 be revealed in the tabulations, this error ought to be corrected at 

 once. These corrections ought to be made before the next step in 

 the process is commenced. 



(20.) Then ascertain the accuracy with which the residual correction has 

 been found according to the method described, and whenever it 

 has been found necessary to alter the residual correction, a cor- 

 rection sliould also be made in the last column of the tabulation 

 papers. 



(21.) Then check after the manner described the accuracy with which the 

 residual correction has been applied, producing a new column of 

 corrected pressure, which he shall compare with the old one, and 

 any error discovered by this comparison shall be corrected at once. 



(22.) Portions of the curve too faint for the ordinary instrument, but 

 capable of being measured by the ivory scale, shall be measured, 

 corrected, and marked as specified. 



Central Observatory (Director'). 



23. The assistant at Kew shall bring all curves and tabulations which 

 exhibit deficiencies personally before the Director of the Central 

 Observatory, and the latter shall make the necessary remarks on 

 the curves and tabulations, or cause them to be made, and shall 

 communicate all cases of failure to the Meteorological Committee 

 on the one hand and to the Director of the observatory where the 



