you will see that each of these item stresses the greater
and greater differences between an history which has been
dedicated to the preservation of Limited Distribution and
something so new it has no history longer than 25 years–

study of aeronautical matters, and there is no doubt whatever
that his work went far in assisting the solution of the problem
of air conquest
Up to the time of his death, in 1857, Cayley maintained his
study of aeronautical matters, and there is no doubt whatever
that his work went far in assisting the solution of the problem
of air conquest. His principal published work, a monograph
entitled Aerial Navigation, has been republished in the
admirable series of “Aeronautical Classics” issued by the Royal
Aeronautical Society. He began this work by pointing out the
impossibility of flying by means of attached wings, an
impossibility due to the fact that, while the pectoral muscles
of a bird account for more than two-thirds of its whole muscular
strength, in a man the muscles available for flying, no matter
what mechanism might be used, would not exceed one-tenth of his
total strength.

the flying cord D is attached at one point only,
and the sides of the boxes provide lateral stability
to a marked degree
Their fore and aft stability is so perfect that
the flying cord D is attached at one point only,
and the sides of the boxes provide lateral stability
to a marked degree.

_Stromberg-Carlson._ Another modification of the central-office
arrangement and also of the subscribers” station circuits, is shown in
Fig. 134, this being a simplified representation of the circuits
commonly employed by the Stromberg-Carlson Telephone Manufacturing
Company. The battery feed at the central office differs only from that
shown in Fig. 132, in that a single battery rather than two batteries
is used, the current being supplied to one of the lines through the
impedance coils _1_ and _2_, and to the other line through the
impedance coils _3_ and _4_; condensers _5_ and _6_ serve conductively
to isolate the two lines. At the subscriber”s station the line circuit
passes through the secondary of an induction coil and the transmitter.
The receiver is kept entirely in a local circuit so that there is no
tendency for direct current to flow through it, but it is receptive to
voice currents through the electromagnetic induction between the
primary and the secondary of the induction coil.

You may ask ‘how am I to know when I am getting a good grade of oil.’
The best way is to ascertain a good brand of oil then use that and
nothing else.

THE CENTER OF PRESSURE.–In such a plane the
center of pressure is near its upper end, probably
near the line 3, so that the greater portion of the
lift is exerted by that part of the plane above
line 3.

_A._–In the case of malleable iron bars it has been found that no very
perceptible damage was caused by 10,000 deflections, each deflection being
such as was due to half the load that produced a large permanent
deflection.

a broad fore and aft surface will not lift as much
as a narrow plane
In experimenting with planes it is found that
a broad fore and aft surface will not lift as much
as a narrow plane. This subject is fully explained
in the chapter on The Lifting Surfaces of
Planes. In view of that the technical descriptions
of the operation will not be touched upon
at this place, except so far as it may be necessary
to set forth the present subject.

must for true Internet surfers
An irreverent compendium of tidbits, resources, and net factoids that is a
must for true Internet surfers. To subscribe, send the following message to

which he traces the principles of flight, and the mechanical
actions of the wings of birds
Borelli”s study is divided into a series of propositions in
which he traces the principles of flight, and the mechanical
actions of the wings of birds. The most interesting of these
are the propositions in which he sets forth the method in which
birds move their wings during flight and the manner in which the
air offers resistance to the stroke of the wing. With regard to
the first of these two points he says: “When birds in repose
rest on the earth their wings are folded up close against their
flanks, but when wishing to start on their flight they first
bend their legs and leap into the air. Whereupon the joints of
their wings are straightened out to form a straight line at
right angles to the lateral surface of the breast, so that the
two wings, outstretched, are placed, as it were, like the arms
of a cross to the body of the bird. Next, since the wings with
their feathers attached form almost a plane surface, they are
raised slightly above the horizontal, and with a most quick
impulse beat down in a direction almost perpendicular to the
wing-plane, upon the underlying air; and to so intense a beat
the air, notwithstanding it to be fluid, offers resistance,
partly by reason of its natural inertia, which seeks to retain
it at rest, and partly because the particles of the air,
compressed by the swiftness of the stroke, resist this
compression by their elasticity, just like the hard ground.
Hence the whole mass of the bird rebounds, making a fresh leap
through the air; whence it follows that flight is simply a
motion composed of successive leaps accomplished through the
air. And I remark that a wing can easily beat the air in a
direction almost perpendicular to its plane surface, although
only a single one of the corners of the humerus bone is attached
to the scapula, the whole extent of its base remaining free and
loose, while the greater transverse feathers are joined to the
lateral skin of the thorax. Nevertheless the wing can easily
revolve about its base like unto a fan. Nor are there lacking
tendon ligaments which restrain the feathers and prevent them
from opening farther, in the same fashion that sheets hold in
the sails of ships. No less admirable is nature”s cunning in
unfolding and folding the wings upwards, for she folds them not
laterally, but by moving upwards edgewise the osseous parts
wherein the roots of the feathers are inserted; for thus,
without encountering the air”s resistance the upward motion of
the wing surface is made as with a sword, hence they can be
uplifted with but small force. But thereafter when the wings
are twisted by being drawn transversely and by the resistance of
the air, they are flattened as has been declared and will be
made manifest hereafter.”