REPORT OF THE KEW COMMITTEE. IxV 



Code of Regulations adopted by the Meteorological Committee 

 for ensuring Accuracy ii: 



RECORDING INSTRUMENTS 



for ensuring Accuracy in the Results derived from their Self- 



la the first place a set of rules have been framed for the guidance of the 

 various observatories, inchiding the Central Observatory at Kew. Secondly, 

 a set of forms have been constructed on which to register the deficiencies and 

 mistakes in the returns from the various observatories, copies of which when 

 filled up are forwarded to the Directors of these observatories on the one 

 hand, and to the Meteorological Office on the other. Thirdly, a diary of 

 operations has been constructed, from which each observatory may know the 

 times at which the various documents ought to be sent to Kew. Fourthly, 

 each month's results are laid before the Meteorological Committee, accom- 

 panied with the remarks of the Director of the Central Observatory, which are 

 then printed in the minutes of that body*. 



Eegttlations fob Barograph. 



Outlying 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 consecutively 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 Barograph Thermometer and the Standard Barometer, and its 

 attached Thermometer, ought to be read five times a day if pos- 

 sible while the light is cut off by the clock- arrangement. The 

 light remains cut off by this arrangement for four minutes, and it 

 is necessary to read the Standard Barometer at the end of this 

 interval — the exact points in the curve corresponding to certain 

 known readings of the Standard may thus be determined. It ought 

 to be noticed when the Standard is heaving or oscillating. 



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

 Greenwich mean time on those days mentioned in the diarJ^ 



(6.) Every change made in the instrument, every stoppage of clock, &c., 

 and all peculiarities in the curve, noticed by the observer, should 

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

 exact time attached thereto. Should the height of the Barometer- 

 cistern be altered, or any change made which will affect the curve, 

 this ought, as already mentioned, to be noticed ; it is, however, 

 considered that all such changes ought to be avoided. 



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

 to Kew every Thursday, as mentioned in the diary. 



* In these remarks there is recorded, amongst other things, each blank in the traces 

 during the montli. The following were the blanks for February 1809 :^ 



Anemograph (direction) 10 hourly records lost out of 4704. 



Ditto (velocity) 20 „ „ „ 4704. 



Barograph 13 ,, „ ., 4704. 



Thermograph (dry bulb) 2 „ „ „ 4704. 



Ditto (wet bulb) 12 „ „ „ 4704. 



1869. 6 



