799. ] 
fa&turer of the county of Somerfet, has 
juft obtained the king’s letters patent, 
fecuring to him, for the ufual {pace of 
time, the fole right to a balance lock 
which he has invented tor the {ame rai- 
fing or lowering of boats between ditfer- 
ent levels inacanal. So far as we can 
judge from inlpecting the {pecification of 
the invention, it is likely to prove very 
ufeful. Weefincerely with the author 
every reafonable fhare of honour and emo- 
lument from his invention. 
Mr. FITZGERALD'S PATENT FOR A 
SIGNAL TRUMPET. 
The mindsjof ingenious men have for 
fome time been turned confiderably to 
the improvement .ot different arts con- 
nected with warfare. Mr. CLERK’s new 
fyftem of fignals, &c. for the ule of a 
fleet at fea, during a naval engagement, 
are faid to have Pemually contributed to 
the great victory which was gained by 
lord Duncan. The telegraphe was 
found to deferve, by its important utility, 
to be quickly borrowed, ‘though an 1n- 
vention of the French, for the ule of 
Britain. 
WILLIAM FITZGERALD, efg, has 
ebtained a patent for the fole manufacture 
and fale of a figual trumpet which he 
has recently invented for increafing the 
powers of, found, by fea or on land. The 
fional is to be given by the application 
of a trumpet to a piftol, or any other 
convenient piece of fire-arms, or {mall 
artillery, in fuch a manner, that the 
found of the difcharge of a piftol, &c. 
may be augmented by it, juft as that of 
the human voice might be by the {peak- 
ime trumpet. The peculiarity of the 
invention confifts in the idea of the ap- 
plication of the trumpet to augment the 
found from the difcharge of any piece of 
Lift of Difeafes in London. i 
229 
fire-arms, and in the contrivance of the 
apparatus, by which the trumpet is 
connected with the piece to be fired. It 
has been made trial of by a committee 
of general military officers, whofe ap- 
probation it has received. It may be- 
come ufeful ona-variety of occafions at fea 
and on fand. 
Mr. ALLISON’S PATENT FOR THE 
MANUPACTURE OF MOROCCO LEA- 
THER FROM AMERICAN HORSE 
HIDES. - 
The fact, that animal fubftances are 
fufceptible of being preferved from decay, 
by being thoroughly penetrated by cer- 
tain aftringent vegetable juices, is the 
foundation of the art of tanning. Com- 
pare the durability of the raw hide with 
that of dreffed leather ; you will not fail 
to be aftonifhed at the power of this art, 
to contribute to the convenience of hu- 
man life. In its prefent ftate of im- 
provement, the tanners are enabled to 
imitate, in their procefles, the afpect and 
texture of the fkins of one {fpecies of 
animals, by the changes which they can 
accomplifh upon thofe of another fpecies. 
Mr. WiLLjAM ALIsoN of Long-lane, 
has recently obtained his majefty’s letters 
patent, fecuring to him, for fourteen 
years, the fole right to his invention foz 
the manufaclure of morocco leather fronz 
American borfe-bides. The hides are to 
be foftened under water, {pread on a 
tanner’s beam; wrought with a knife on 
the fleth fide; fubjected to the aétion of 
lime-water; treated under it, as goat’s 
fkins, of which morocco-leather is made ; 
put into hot-water, with dog’s dung, 
again wrought on both fides, with aknife 
onatanner’s beam, put into. blood-warm 
water with bran, then tanned with fumach, 
as goat’s {kin morocco. 

LIST OF DISEASES IN- LONDON, 
From the 20th of February to the 20th of March; 
of a Phyfician at the 
ACUTE DISEASES. 
No. of Cafes. 
Catarrh 2 - - 37 
Acute Rheumatifm - ~ 7 
Inflammatory Sore-throat - 4 
Opthalmia - - 2 3 
Peripneumony - = - 2 
Malignant Fever - = 7 
Scarlatina Anginofa - ~ 410 
Meafles - , - = 7 
Hooping Cough . ~ - 3 
Small Pox - - ey: 
Herpes Zofter - - “ I 
Child-bed and Milk Fevers - “4 
Acute Difeafes of Infants  - - I 
being the refult of the public and private praflice 
veff cnd of the town. 
Tertian ~ ~ - 2 
CHRONIC DISEASES. 
Cough and Dyfpnea - - 7 
Eicemoptoe - - - 5 
Pulmonary Confumptior - IZ 
Chronic Rheumatifm - ee 
Sciatica - - - aie ee 
Afthenia, — - - - 19 
Dropfy ~ ~ - - 6 
Paralyfis - - “/ 6 
Apoplexy - - 2 
Cephalia and Hemicranium - Io 
Vertigo and Syncope - - 6 
Hyfteria - - 3 
st. Vitus’s Dance - 3 
sy {pepfia 
\ 

