468 Storm Compass.— Patents. 
STORM COMPASS, 
To Mr. Tilloch. 
Sir,— The subject of the compass having been inserted in your 
last Number, I take the liberty to advert to a new storm com- 
pass which was introduced into the port of Genoa by a Danish 
vessel. The Baron de Zach first called my attention to it, and 
I took a sketch of it at the time; but as it appears to me suf- 
ficiently explained at page 200 of The “ Correspondance Astro- 
nomique,” &c. 1 shall simply submit a translation. 
It seems an interesting improvement, and may be useful ; and 
it might have escaped my recollection, but for the incident in 
question. 
<¢ All the secret of the storm compass consists in this, that the 
cap fixed at the bottom of the box is mounted according to the 
suspension of Cadran. ‘lhe whole compass is suspended a da 
Cadran, and the cap in like manner: thus the motion of the ves- 
sel is doubly counterbalanced. The cap reversed, is mounted in a 
kind of fork which attaches to the bottom of the box ; it balances 
in this fork, and carries below a little tail of copper, which serves 
as a counterpoise for it in the different balancings on every side. 
We can now easily comprehend that the needle ef such a com- 
pass ought necessarily to experience fewer shocks in the violent 
movements of a ship upon a stormy sea, than in ordinary com- 
passes in which the box is well counterbalanced, but not the card. 
It is on this account that it receives the name of sf/orm compass. 
I have the honour to be, sir, 
Your most obedient humble servant, 
London, June 1, i819. J. Murray. 
LIST OF PATENTS FOR NEW INVENTIONS. 
To Edward Wall, of Minchinhampton, Gloucestershire, for 
certain improvements on stage-coaches, and other descriptions 
of carriages.—18th May, 1819. 
To George Atkins, of Hornsey-road in the parish of Islington, 
Middlesex, for his instrument for ascertaining the variation of 
the compass, which he intends to denominate The Meridian De- 
clination Dial.—18th May. 
To John Thomas Barry, of Plough-court, Lombard-street, 
London, for his improved appurtenances for distillation, evapo- 
ration, exsiccation, and for the preparation of colours.—24th May. 
To William Geldart and John Servant, both of Leeds, and 
Jonathan Howgate of Leeds, for certain improvements in the man- 
ner of heating dryhouses, maltkilns, and other buildings requir- 
ing heat.—l1st June. 
To Charles Attwood, of Bridge-strect, Blackfriars, for a mode 
of manufacturing mineral alkali and vegetable alkali, and the ap- 
plication 
