136 
preference to any other number, in a 
longitudinal direction’ parallel to each 
other, and at such a distance asunder, 
that the body may be effectually sustain- 
ed, The cranes are made of two pieces 
each, to be secured or screwed to the 
body of the carriage, withoutjoining each 
piece together in’ the middle. The 
springs may be made of any convenient 
figure or structure, and may consist el- 
ther of transverse single bows, with other 
bows fixed horizontally on the ends, of, 
and at right angles to the same, such as 
have been commonly used in long coaches, 
and, accordingly, the said springs may 
consist each of two bows, joined at the 
ends and disposed longitudinally, suchas 
have been commonly used and applied 
in curricles, gigs, and other carriases un- 
der the denomination of grasshopper 
springs. To these the patentee gives a 
decided preference for the application of 
his improvements. 
‘ ee sae - 
MR. MICHAEL LOGAN’s (ROTHERHITHE,) 
for a System of Marine, Fort, and. 
Field Artillery. sem 
This new system of construction, and 
the principles of operation are rendered 
conformable to the following maxims and 
explanations. 1. The cannon or gun 
carriage is reduced so as to occupy the 
least possible space, and to present the 
least surface to. the action of the fire of 
the enemy. 2. For the security of the 
gun carriage in time of action, when em- 
ployed for sea service, or as marine or. 
fort artillery, it is covered from the fire of 
the enemy by the gun and folcrum, and 
is by construction rendered permaucnt,. 
and always true to the centre of the port 
or embrasure. 3, The recoil or. re-ac- 
tion of 2 cannon is performed within the 
carriage itself, and can be diminished or 
increased at pleasure. 4, The horizon- 
tal range, and the elevation or depression 
of cannon in time of action are correctly 
performed, with security to those employ- 
ed in the operation of this artillery. 
5. The gun-carriage contains the least 
quantity cf materials of which it can be 
made,. and tne strongest fortification 
against the effects of either slot or shells, 
‘These are the ynaxims observed in the 
ro 
New Patents lately enrolled. 
. following parts. 
4 : 
[March 1, 
construction: after which follow the de- 
scription and explanations of the nature 
of the invention, which consists of the 
First, the body of the 
carriage, which may be made of wood, 
iren, or other metal. Secondly the ful- 
crum made of cast iron, and which sup- 
ports the piece of ordnance or cannon by 
its trunnions upon the-carriage, either by 
a single cvlinder, or by two parailel cylin=- 
_ders in a horizontal position upon iron 
axlés. Thirdiy, the train bar and y jeer 
der, with the gun-screws and bed of the 
cascable, which in time of action elevate — 
or depress the breeth of the cannon, or 
in other words, determine thé position of 
the gun’s axis to the plane of the horizon. - 
Fourthly, the recoil-chain with its fore 
roller, chain, staple, and butt-pinion, 
fixed on iron axles in the front and butt 
of the carnage. Fifthly, the bolster or 
head-bearing, and the legs which are 
united and combined in construction by 
the tie or span iron, parallel to the base 
of the carriage, Sixthly, the centre pm 
and tore staple, which is fixed by strong 
bolts to the lower sill of the embrasure, 
Seventlily, the train-post and swifter, by 
which one man only is enabled to give- 
the heaviest artillery or piece of ordnance 
its horizontal range with a steady aniform. . 
motion, and to sustain it with the great- 
est care in any assigned position, either 
upon the deck of a line of battle ship, 
or other ship of war, or on the platform 
of a battery in time of action, 
The great. length of this specification 
prevents us from going farther into the 
subject, than to observe that Mr. Logan 
in his exemplification limits himself to a 
description that applies to @ thirty-two 
pounder: and having explained the con- 
struction and application of this systein 
of artillery as employed in marine and 
fort service, he says it 1s in his intention, 
to construct and bring into practice, 
such a set of wheels as shall receive the 
cairiage before described, with its ord- 
nance already mecunted, so that the same_ 
artillery may at any time, or on aby oc- 
casion of necessity, be taken either from 
the deck of a ship of war, er from the, 
platform of a battery, and brought to. 
action jn the service of the field. 
? 
MONTHLY 
