CO129-206 - Public Offices & Others - 1882 — Page 515

製

509

'

in the Colony the Superintendent will no doubt be able to make many practical suggestions

and on this ground,

that do not now occur

cannot consider it in the light of a misfortune, that we should start on a reduced plan and mcrease the scope of the work of the observatory, Step by step- as personal Experience may hereafter dictate to the scientific officer in charge. Another omission in the list of instruments for= nished by the Kew Committee is the Electrograph which would cost about £85 verified and erected in Situ . In considering the reductions to be made, this mistrument was only deferred, as being of less importance to the Completeness of the meteors logical branch than the others, and also because perhaps it is not too much to say (Ispeak subject to correction ) that it has scarcely yet emerged from the Experimental stage sufficiently to

indispensable and prac

" recent its position.

as an

ical working accessary to an observalary. The

Electrograph

can however be added now or at any

future time without further Expanse than the cost 585")

Zito

its purchase and erection. It will not Entail. any sehra building Expense,

as I have left ample

room for

it in the same chamber with the Caro- =graph and thermograph.

In recapitulation Imay again mention that the disposation of the instruments will be as " follows: the barograph, thermograph and Eveq = mally, the slectrograph will be placed in the Meteorological Chamber which will be kept free from draughts,

more specially "ophe barograph; the anemograph will go

on account

in

The turret ; The Sunshine recorder will be fixed

on a Stone block on the will stand in a corner.

roof; and the

~ rain guape. "the lawn 100 feet 7

distant from any building.

atit

maximum.

On the subject of the Anemograph I cannot help mentioning here my fear that the instrument in use in European observatories which I have bxamined, will scarcely stand the text of a song Kong typhoon. Experience with be sure to prove. that a much stronger instrument must be de- signed of it is to outlive a cyclone and accuse.

accurately recard the wind pressure a With regard to the horological instruments I should point out that the Sidereal Clock must

best possible construction, for it will be under Constant test by the remarkable incissitudes of temperature of the Hong Kong Chi

The

mean time clock rud not ne

necessarily : the same high standard of Excelle

Excellence for it will be kept corrected from day to day by

be

07

mate.

be of

the very

is a ball.

hine

ncau hub

Siderca l'clock and Star observations. The time ball included in the Ishimate at f 400,

of six feet in diameter discharged by an Electric trigger Connected with the clock. The apparatus will be of the same patteris as the time balls supplied by Farley to the Govery. ments of Natal and of India for Bort Elizabeth. and Calcutta respectivel. I do not suggest a ball. of larger diameter than six feet because it would be unwieldy and the increased bulk would sepose it to destruction by typhoons; besides, with an increased bulk, wind-pressure would make the drop Sluggish, where as to be.

Le of

t