~ 
ao 
dations were detailed with ability; and 
mining the ganie ra 
an 
the interest of the whole was increased 
by acute observaticns on the mode of 
examining and discriminating rocks—a 
subject of great importance, particular ly 
te those who may be employed in exa- 
logy of a country, 
and {9th of December 
th 
lo 
On the 131i er, 
10r of Br 
ef obecshl aut itish Mimera 
_Tegy, delivered } his long promised Borate 
“7; ee L S T 
on Chromatometry, at bis house in Mead 
piece, near the Asylum. This lecture, 
the eaject of which is, toe point oué a 
new aid ingenious mode of ascertai 
fhe arrangement, mixture, and mea 
OF prismatic tints, and to shew their cor- 
-ef this boat is as follows 
* 
Fespendence with material colours, was 
accompanied-by an exhibition, in which 
the prismatic tints 
from the sun, moon, ané stars; thesun as 
seen from the dificrent planets, anda 
productor, sixty feet long, measuring an 
wmifinite series: also the material and 
prismatic tints, forming mixtures in union, - 
with the efleet as from candles and flam- 
beaus, anda sort of prismatic jlumina- 
tion, with diferent justres trom metals, 
&c. The whole waselucidated by appa- 
ratus of a new and original, kind, which 
promises to assist the philosopher in 
greatly. extending our knowledge on this 
subject. Mr. Sowerby continues to re- 
peat the lecture every Monday, ‘and has 
announced a work, 
discoveries. 
SirW. Ciarces, Bart. has constructed 
a life boat.on an improved principle, the 
leading features of which, are,, that she 
will not upset, sink, or be water-logged ; 
that she affords cabin room, and is like a 
man of war’s launch, well built for row- 
ing, the oars not on a curve, but nearly 
in a right line and low to the water, of 
which she draws little. The description 
:—her length is 
thirty feet, her breadth ten, ber depth 
three fect, we inches tne space be- 
tween bee timbers is fitted up with pine 
wood ; this is done witha view to prevent 
the water lodging there: the pine wood 
is well caulked and paid ; she is buoyed 
up by eight metal cases, four on each 
side; these are water tight, and indepen- 
dent of each other. They will serve to 
buoy up six tons, but all the buoyant 
parts of the boat, taken collectively will 
buoy up tentons. The cases are secure- 
ly decked over, and boarded at the sides 
with pine; there isascuttle to each case, 
to put. goodsin; the edges are lined with 
baize ; and over each Scuttle, i in the case, 
is one ‘of wood of a larger size, the mar- 
Literary and Philosophical Intelligence. 
were preduced, as 
illustrative of his - 
“and rowed by fourteen men, with oars, 
To 
to exclude the water: between the cases 
are Norwegian balks, bolted to the bot- 
tom, fastoned. to each other by iron 
clamps, and decked over, The depth of 
ber aa is nine inches below the gar- 
board streak, the dead rising 4s) four 
sbehiee! her keel i ig harrow at the-under 
part, and wide abot e, for the purpose of 
giving the timber a good bed, which will 
support the bolts, m ease’a necessity 
should ‘arise to encounter sand-banks. 
In sailing over a bar, or in places where 
the water is pope: the rudder will, 
wiih ease, ae yup even with the keel, 
and when in’deep water, it will leodown 
cee vith equal facility a foot be- 
low it, in consequence ‘of which advantage 
the boat is found to steer remarkably well. 
easuy, 
~The forecastle of the boat forms 2 cabin - 
ten feet wide, six feet Jong, and four feet 
deep, mto which women, elildren, and 
disabled ate may be puts it is-am- 
ply” supphed with air, by means of 
two copper ventilators; it is furnished 
besiles with two grapnels, very proper to 
be thrown out on board a wreck, te ride 
by; the grapnel ropes will assist the suf 
ferers to remove and _ escape from the 
wreck to the boat. #She* is likewise 
equipped with masts and sails, and is as 
manageable with them as any boai of 
her dimensions can possibly be: in a 
tempest, however, she must be dismasted 
sixteen feet long, double banked; the 
men are all fastened»to the thwarts by 
ropes, and cannot be washed from their 
=. In his obServations on this boat, 
Sir William says, “ Having stated the 
edie features of my boat, } need not 
dwell on a few secondary points, which, 
however, it would be improper not to 
mention: these are -her being provided 
with small ropes or lines fastened ' to 
hooks on the gun-wale, and each having a 
piece of cork patted red at the extremity ; 
intended not only for persons who fall 
overboard, or swim froma wreck, to see 
and cateh hold of, but to tow those for 
whom there may not be reom in’ the 
boat; and her having a very powerful 
rudder, The copper cases, though afford- 
ing additional security to those, “who 
chuse to be at the expence, are no"mere 
a necessary point of my plan, than copper. 
ing her bottom. The wood ‘work alone, if 
well executed and properly attended to, 
may be kept quite air-tight. If the as. 
sistance of cork were to be called in, vit | 
appears to me that it might be-better 
applied than in the other boats, by me 
[Feb 1, ~ 
gin of which is ned in the same manner. 
~~ Se 
