180 REPORT—1850. 
apparatus in the Electrical Observatory having been filled with good olive 
oil, and provided with wicks of the usual uniform size, which have not been 
used more than three or four days, to be at sunrise of every day, excepting 
Sundays and Wednesdays, lighted and placed in their usual positions for 
observations. 
“Αἴ one hour after sunrise, or as near to that time as possible, an obser- 
vation of the barometer, its attached thermometer, the standard thermometer, 
the wet-bulb hygrometer, the balance anemometer, and the wind-vane, to- 
gether with remarks on the state of the sky, to be made and entered in the ἡ 
appropriate columns and page of the printed form headed ‘ Electro-Meteoro- 
logical Observations,’ &c., noting also the time of these observations, &c. 
having been commenced. 
* As soon as possible after these entries have been effected, a note of the 
kind and tension of electricity to be made and recorded, with the time, on a 
paper, called a ‘Frequency Paper, and immediately afterwards the principal 
conductor to be discharged suddenly and allowed to assume a new charge. 
* A series of notes of tension, with the times, to be then commenced for 
the purpose of ascertaining (as nearly as the conditions below stated and 
other circumstances will permit) the length of time which may elapse between 
the moment of allowing the new charge to commence and the moment of 
that new charge arriving at a maximum tension. These notes of tension and 
times to be also set down upon the above-named frequency paper (or papers), 
together with any variation in the kind (positive or negative) of charge which 
may have occurred. 
“ The primary observation of kind and tension to be copied into the 
columns headed ‘kind’ and ‘ pericdical ebservations’ respectively ; and the 
length of time which may elapse (as above) for obtaining a maximum ten- 
sion, in the column headed ‘frequency’ of the above-mentioned printed 
form or journal. 
“ If a maximum tension should occur at any time after the expiration of 
half an hour, and within one hour, from the moment of allowing the above- 
mentioned new charge to commence, then fresh observations of the baro- 
meter and of the above-named other meteorological instruments, with remarks 
on the state of the sky, to be made as nearly as possible at the time of the 
maximum. This second set of observations of the barometer, &c. to be 
also entered in the printed form as before, with the times of these observa- 
tions having been commenced. 
“If a maximum tension should not occur before the lapse of one hour 
after the moment of allowing the above-mentioned new charge to commence, 
the series of notes of tension (which serve for endeavouring to attain the 
frequency observation correctly) to be discontinued ; and the circumstance 
to be noted in the ‘ frequency paper’ and the printed form as above. 
«ΤΠ lamps of the electrical apparatus to be kept burning and ready for 
observations from the time of being lighted until one hour after sunset. The 
charcoal stove (Joyce’s) to be lighted and kept burning whenever the hygro- 
meter indicates a damp state of the atmosphere; in order to preserve a suffi- 
cient insulating power in the distinguisher, &c. 
«Αἴ one hour after meridian, or as near to that time as possible, and at 
sunset, the frequency observation, accompanied by observations of the baro- 
meter and other above-mentioned meteorological instruments, and remarks 
on the state of the sky, to be repeated. An observation of the rain and 
vapour-gauge to be also made at sunset (only), and the whole to be entered 
as before. The rain and vapour-gauge to be set at or near to this time. 
“ The frequency papers, the electro-meteorological journal, and the chro- 
nometer, to be kept usually ona table at the south end of the Transit Room. 
