XXXiv REPORT—1858. 
Magnetometer, similar to those employed in the British Colonial Observato- 
ries, a Unifilar Magnetometer, and a Dip Circle. 
Application has also been received from the Rev. Alfred Weld for Mag- 
netical and Electrical apparatus for the Stonyhurst College; these are in 
course of preparation, and Mr. Weld has received instructions in the use of 
the magnetical instruments. 
Two Dip Circles by Barrow, furnished with Dr. Lloyd’s apparatus for the 
total force, which were sent to the Observatory preparatory to their being 
forwarded to the Austrian and Russian Governments, were carefully examined 
and adjusted. 
An extensive series of observations made with various dipping-needles and 
circles, have confirmed the results previously obtained at the Observatory as 
to the value of the Magnetic dip. 
The Self-recording Magnetometers have been in regular action since the 
Ist of January, and have performed satisfactorily; some difficulty arose in 
the manipulation of the Balance-magnet, but this has been surmounted, and 
this instrument now performs with as much accuracy and delicacy in its 
action as either the Declinometer or Bifilar Magnet. 
The Photoheliograph erected in the dome of the Observatory was fully 
described in the last Annual Report; it has been repeatedly at work since the 
beginning of last March, and excellent photographic pictures of the solar 
spots and facule were obtained. Certain alterations have been made by 
Mr. Welsh in order to regulate the time of exposure of the collodion plate 
to the sun’s action; with these alterations the instrument gives very good 
results, but certain improvements in the arrangements of the secondary mag- 
nifying lens are under consideration, with the view of avoiding the depiction 
on the collodion negative of the inequalities in the glasses which compose it. 
The Committee recommend that arrangements should be made for the 
appointment of a competent Assistant, who will undertake the taking of the 
photographs and the preparing of a certain number of copies for distribution 
to some of the principal British and Foreign observatories. 
George Whipple has been engaged to assist in the general work of the 
Observatory at a weekly pay of ten shillings. 
Mr. Beckley’s arrangement of the Anemometer described at the Cheltenham 
Meeting of the Association has been adopted and carried out in an apparatus 
made by Mr. Adie for the East India Company. This anemometer having 
been mounted at the Observatory, remained for some time, and was found to 
perform satisfactorily ; it was shown to many persons, and examined by 
Admiral FitzRoy, General Sabine, and Mr. Osler, members of the Anemo- 
meter Committee. Certain modifications since suggested by Mr. Beckley, 
have been adopted in two instruments constructed by Mr. Adie for Admiral 
FitzRoy’s department in the Board of Trade. 
The verification of Meteorological Instruments has been continued on the 
same plan as in previous years. The following have been verified since the 
last meeting of the Association to the Ist of July :— 
Baro- Thermo- Hydro- 
meters. meters. meters. 
For the Admiralty .......... of. dara © 75 
For the Board of Trade ........ ye ie 60 126 
For Opticians and others................ 86 142 150 
Total 22) 268 150 
Among the latter are included 50 barometers and 150 hydrometers for 
