178 REPORT—1850. 
vice-bench, &c., in order to render it efficient for experimental purposes, and 
to avoid the great delay and expense occasioned by having to send to London 
for many articles which can be constructed here. 
The Principal Conductor on, and in, the Dome is in an efficient state, but 
should be dismounted and cleansed, &c. The slight inclination spoken of in 
my last Report has been remedied. 
The Volta-Electrometers in the Dome have been repaired. 
The Galvanometer (Goujon's) appears to have lost a little in sensibility, 
the needles being no longer perfectly astatic. 
The Discharger, the Gold-leaf Electroscope, the Distinguisher, and the 
three Night-registering Electrometers are ettective. 
The pair of portable Volta Electrometers, and the Peltier’s or rather 
Erman’s Electrometer, are in working order. 
The lectrograph (at the central window of the upper south room) has 
been somewhat damaged by a violent storm. It is intended to repair it, re- 
move it to the dome, and connect it with the principal conductor there after 
the preliminary observations on frequency have been accomplished. 
The Wind- Vane has been restored. 
The Rain and Vapour-Gauge, and the Balance Anemometer, have been 
properly examined and adjusted at the requisite intervals. 
The Standard Thermometer, and the Wet-Bulb Hygrometer, have been 
removed from their position at the north window of the Quadrant Room, 
and mounted on a thermometer stand. 
The Ordinary Barometer has been (again) compared with the Royal 
Society’s Instrument. 
The Kreil’s Barometrograph has been repaired, and a few curves have 
been drawn by it. 
The Photo-Barometrograph has been removed from the Transit Room to 
the Quadrant Room, and has had a little alteration made in it for the purpose 
of rendering it applicable to either the Daguerreotype or the Talbotype pro- 
cesses. It still requires further alterations and improvements. 
The Declination Magnetograph (in the Transit Room), described in the 
Phil. Trans. part 1 for 1847, has had some alterations made in it similar to 
those made in the Photo-Barometrograph. 
A Horizontal-Force Magnetograph has been added to our collection, from 
apparatus sent from Woolwich, with my photographic self-registering arrange- 
ments, This instrument is in most respects similar to that described in my 
last Report, and sent to Toronto; the differences will be alluded to and easily 
understood when the experiments, &c. for the construction of the vertical- 
force instrument sent to Toronto are described below. 
Also some apparatus of an improved kind, used in the Daguerreotype 
process. 
An instrument for dividing right lines (necessary for the scales, &ce. of all 
self-registering instruments), and a new kind of compasses or dividers, will be 
described under the head of “ Experiments,” as they are not yet considered 
to be complete. 
The Storm-clock is in proper working order, and greatly facilitates obser- 
vations on frequency. [As it is applicable extensively to meteorological, and 
even some astronomical observations, it should perhaps have the more general 
appellation of “ Observer's Clock.” ] 
The description of this instrument in our Journal for 1844-45 not having 
been printed, the following short account of it may not perhaps be deemed 
unnecessary :— 
A (in Plate IT. fig. 1) is a strong deal table firmly secured upon the stage 
in the Electrical Observatory. B is an inclined writing-board solidly attached © 
