270 
THE YOUNG SCIENTIST. 
pitching of the vessel. Bregviet conceived 
the bold thought of inclosing the whole 
mechanism of the escapement and the 
spring in a circular envelope, making a 
complete revolution every two minutes. 
The inequality of position is thus, as it 
were, equalized in that short siiace of 
time; the mechanism itself producing 
compensation, whether the chronometer 
is subjected to any continuous movement, 
or kept steady in an upright or an in- 
clined position. Breguet did still more ; 
he found means to preserve the regularity 
of his chronometers even in case of t heir 
getting any sudden shock or fall, and 
this ]ie did by the parachute. Sir Thomas 
Brisbane put one of them to proof, carry- 
ing it about with him on horseback and 
on long journeys and voyages. In six- 
teen months the greatest daily loss wa.s 
only a second and a half — tliat is, the 
57,600th part of a daily revolution. 
Such is the encouraging example of 
Breguet, who was at first only a work- 
man ; and to this he owes his being the 
best judge of good workmen, as he was 
the best friend to them. He sought out 
such everywhere, even in other countries ; 
gave them the instruction of a miister of 
the art, and treated them with the kind- 
ness of a father. They were indebted to 
him for their prosperity, and he owed to 
them the increase of fortune and fame. 
He well understood the advantages of a 
judicious division of labor, according to 
the several capacities of artisans. By 
this means he was able to meet the de- 
mand for pieces of his workmanship not 
less remarkable for elegance and beauty 
than for extreme accuracy. It may in- 
deed be said that Breguet's efforts gave a 
character to French horology that it has 
never lost. So much may one man do in 
his day and generation to give an im- 
petus to an important branch of national 
industry. 
Aerial NAviGATtoN.-~A discovery has 
been made in Paris of the twelve manu- 
script books an aerial navigation, by 
Leonardo da Vinci. The screw propeller 
is the system on which Leonardo made 
his experiments, and his sections and 
diagrams are all clear and neat. 
Art at Home— Artistic Household 
Adornments at Small Cost. 
YEKY handsome ornament can 
be made of an un glazed terra 
cotta vase. This ware is por- 
ous, and hence it can be easily 
saturated by placing the vase in a bucket 
of water for twenty-four hours ; then re- 
move it and scatter over the surface 
small seeds, completely filling the inter- 
stices, from Avhich there will shortly ap- 
pear a.n interesting germination, forming 
a " living vase " that is remarkably orr.a- 
mental. When the plants are developed, 
to prevent them from becoming detached 
take pack thread or fine wire and pass a 
row or two around the vase; the sa,me 
will soon be concealed by the increased 
vegetation. Should the vase selected or 
preferred be a non-porous ware, cover it 
with a i)iece of cloth thoroughly wet and 
scatter over this the seed, the growth of 
which will be very prolific and exceed- 
ingly novel. 
A pretty piece of industry for the warm 
weather may be found in utilizing a yard 
or two of " butcher's " linen. Fring« out 
the edges, and for a pi'etty heading draw 
out the threads to the width of an inch, 
hemstitch the same with French em- 
broidery cotton ; for the centre draw with 
a lead pencil a wreath of scroll work and 
trace over the lines with cotton a chain 
stitching, and where the curves are sharp 
do them in double chain stitch which 
gives a pretty change producing quite an 
ornamental pattern. When the article is 
finished it can be used in several ways if 
spread over the centre of a dark table- 
cloth. Where the gaslight or lamplight 
is reflected on the white linen, the effect 
is very novel. A set of covers for a 
bureau and washstand can be easily made 
of this same style of linen. Fringe out 
the ends to the depth of four inches, then 
knot a heading by taking ten threads in 
a cluster and tying the same at the top ; 
over the tie, knot a coarse thread of 
French embroidery cotton, clipping the 
ends closely; dot the sidles with the same 
kind of thread, which must be carried to 
the next dot without clipping, and in this 
manner a pretty network is traced with- 
