REPORT OF THE KEW COMMITTEE. Ixvii 



failure occurred on the other, making any remark that may tend 

 in his estimation to obviate in future the cause of faihire. 



(24.) He shall also communicate as above the monthly mean differences 

 between the Earograph readings reduced, and the simultaneous 

 Standard readings. 



(25.) He shall also communicate as above the result of forty remeasure- 

 ments for each observatory for each month, to be made at Kew, 

 noting (1) the greatest difference, (2) the mean difference irre- 

 spective of sign, (3) the residual difference (if any), taking signs 

 into account. 



Regulations fok Theemogeaph. 

 Ouilying Observatory. 



(1.) The curves, journals, and tabulation forms to be written upon accord- 

 ing to the pattern furnished. 



(2.) Always begin a new month with new forms. The curves and forms 

 are to be numbered conseciitively from the beginning of the year, 

 as will be seen from the diary. 



(3.) Clock to be set to Greenwich mean time at starting, and its error not 

 to exceed two minutes in two days. 



(4.) The Standard Thermometers should be read at least five times a day 

 at those moments when the light is cut off by the clock-arangement. 

 The mode of dealing with the wet bulb has been already de- 

 scribed, p. Iviii. 



(5.) The instrument should always be started between 10 and 11 a.m. 

 Greenwich mean time, on those days mentioned in the diary. 



(6.) Every change made in the instrument, every stoppage of clock, <fec., 

 and all pecuharities in the curve noticed by the observer, should be 

 inserted in the journal under the head of " Remarks," with the 

 exact time attached thereto. 



(7.) The muslin and connecting threads ought to be taken off the bulbs, 

 washed and replaced as often as they become soiled. 



(8.) The previous week's curves, journals, and tabulations should be sent 

 to Kew every Thursday, as mentioned in the diary. 



Central Observatory (Assistant). 



(9.) The assistant shall examine each curve in order to see if there is any 

 want of light, bagging, finger-marks, bad photogTaphy, or defective 

 action of wet bulb, during however short a space of time. 



(10.) He shall see that the clock and clock- stop have been in good actio-n 

 for the time of the curve. 



(11.) That the instrumental clock does not differ more than two minutes 

 from the chronometer as recorded on the curve. 



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

 front. 



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



(14.) That in the Thermograph Journal the ])roper day of the mouth is 

 placed alongside of Sunday, and that the others follow conse- 

 cutively. 



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

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



e2 



