18or.] 
diftin& varieties. When a fecond arm is 
placed on the matt a little below the firft, 
and moved in a manner precifely fimilar 
to the firft, the fame pofitions will take 
place here as before ; but to avoid confu- 
fion and indiftinétnefs, the vertical pofi- 
tions of the fecond are entirely omitted, 
leaving therefore 6 pofitions for the fecond 
arm. As however it will be difficult to 
diftinguifh at a diftance which of the arms 
1s in motion when only one of them is 
employed, the fixfignals of the lower arm 
are not ufed alone, but only in conjunc- 
tion with the upper one. Thefe two will 
therefore give 43 dijfinéf fignals (thofe 
that are likely to be miftaken being omit- 
ed). By adding more arms, the number 
of fignals will be amazingly encreafed ; for 
three arms will ‘furnifh 301 diftiné: fig- 
nals (42 being omitted as indifting&), 
and four arms will give 1849 (omitting 
582). Thus a four-armed telegraph thus 
conitruéted will give nearly as many fig- 
nals as there are words in the language, 
and yet will not require much difficulty 
to be worked. Independently of thefe, 
‘the inventor adds another variety, which 
is to raife or deprefs by a fuitable appa- 
ratus the middle arm, where three only 
New Patents lately enrolled, 
53% 
are employed, fo as to place it very near 
the upper or the lower one; and this ine- 
quality of diftance between the_ three 
arms will be vifible as far as the arms 
themfelves, and ferve as a bafis for a frefh 
feries of fignals. This will give 252 
new combinations for the elevation of the 
middle arm, and'the fame number for its 
deprefficn, which will add a total of so4 
to the 301 abovementioned, whereby a 
three-armed telegraph with this variety of 
ftructure, will command 805 diftiné pofi- 
tions. ‘The inventor Jikewife adapts this 
for night fervice, by fufpending {winging 
lanthorns to the arms by an ingenious ap- | 
paratus. He calculates that a maft about 
26 or 28 feet high will allow the fignals 
to be feen at a moderate diftance. By di- 
viding it in two pieces, it may be carried 
on alight cart with eafe, as the weight - 
will not. exceed 4. or 500 pounds, and it 
will thus become readily portable, and 
will not require morethan a quarter of an 
hour to. be fet up or taken down. The 
inventor likewile adds, that when an army 
enters an enemy’s country, it would be 
advifeable to have efcorts of portable te- 
lesraphs to convey a fpeedily intelligence 
from head-quarters to Paris. 
THE NEW PATENTS 
LATELY ENROLLED. 
EL 
MR. WILDE, for @ HARROW 0” a NEW 
CONSTRUCTION. 
HE ufe of the common harrow is 
often attended with fome inconve- 
niences, of which the chief are, that in 
rough or very floping land the work is 
apt to be done unequally, owing to a 
greater bearing on one part of the harrow 
than another, and likewife the harrows are 
liable to work unftéadily, and thereby the 
tines often follow each other’s track, in- 
ftead of keeping a feparate direction. 
The invention of the Patentee is intend- 
ed to obviate thefe inconveniences, and 
from the ingenuity and fimplicity of the 
conitruction it appears to deferve' the at- 
tention of farmers. The fet of har- 
rows, when put together for work, confifts 
of four, of the ufual conftruétion, and 
with the ufual number of tines. They 
ftand nearly parallel to each other, but 
not-entirely ; they are faftened together 
_by three iron links, moveable where they 
join on to the harrow, and of thefe three, 
the neareft the horfes and the furtheft are 
fet ftraight, but the middle one is fet very | 
obliquely, and is longer than the other 
two. /The links are fet loofely, that there 
may be a little play between the harrows 
when joined together, but too much mo- 
tion is prevented by the pofition of the 
middle link. Much pains is taken like- 
wife in joining the harrow to the bearing- 
bar to which the traces are faftened. This . 
is done by an iron pin fixed on the chain- 
hook which paffes through holes in the 
bar made at different diftances, fo as ex- 
actly to give the requifite direction to the 
courle of the harrow. By thefeand other 
methods the equal courfe of the harrow is 
fecured, and the work is done more equally 
and regularly. 
The Patentee makes the harrows forfive- 
yard lands (not including the furrows); but 
they may be made to any fize that may be 
wanted. Likewife, the borfes may be fet 
ejther to pull abreaft, or elfe to go in a 
line in the furrow when the land is very 
wet and heavy, and the treading of the 
: horfes 
