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MEASURING LIFT AND DRIFT.–In Fig. 6, A is the
plane, B the horizontal line which attaches the
plane to a scale C, and D the line attaching it to
the scale E. When the wind is of sufficient force
to hold up the plane, the scales will show the same
pull, neglecting, of course, the weight of the
plane itself.

(econferences) on topics of interest to scholars
‘This directory contains descriptions of 805 electronic conferences
(econferences) on topics of interest to scholars. E- conference is the
umbrella term that includes discussion lists, interest groups, e-journals,
e-newsletters, Usenet newsgroups, forums, etc. We have used our own
judgment in deciding what is of scholarly interest — and accept any advice
or argument about our decisions. We have placed the entries into
categories by deciding what the *dominant* academic subject area of the
electronic conference is.’

A. To allow the point of the carbon and the electrode to touch to form a
circuit; this scale being a non-conductor of electricity and with it on,
the current would not pass from the carbon to the electrode and holder.

designed to ’split’ the air, forgetting, apparently,
that in other parts of the machine every effort is
made to prevent head resistance
Both of these types have pronounced bulges,
designed to ’split’ the air, forgetting, apparently,
that in other parts of the machine every effort is
made to prevent head resistance.

_A._–A single engine is no doubt more liable to stick upon the centre than
two engines, the cranks of which are set at right angles with one another;
but numerous paddle vessels are plying successfully that are propelled by a
single engine, and the screw offers still greater facility than paddles for
such a mode of construction. In the screw engine referred to, as the
cylinder is laid upon its side, there is no unbalanced weight to be lifted
up every stroke, and the crank, whereby the screw shaft is turned round,
consists of two discs with a heavy side intended to balance the momentum of
the piston and its connections; but these counter-weights by their
gravitation also prevent the connecting rod and crank from continuing in
the same line when the engine is stopped, and in fact they place the crank
in the most advantageous position for starting again when it has to be set
on.

Modern government is a machine. The more modern a government is, the
more the machine in it is emphasized. Modern trade is a machine. It is
made up of (1) corporations–huge machines employing machines, and (2)
of trusts–huge machines that control machines that employ machines.
Modern charity is a machine for getting people to help each other.
Modern society is a machine for getting them to enjoy each other.
Modern literature is a machine for supplying ideas. Modern journalism
is a machine for distributing them; and modern art is a machine for
supplying the few, very few, things that are left that other machines
cannot supply.

But No. 4 was soon too imperfect for the exacting Brazilian, and in
April, 1901, he had finished No. 5. This air-cruiser was the longest of
all (105 feet), and was fitted with a sixteen horse-power motor. Instead
of the bicycle frame, he built a triangular keel of pine strips and
strengthened it with tightly strung piano wires, the whole frame, though
sixty feet long, weighing but 110 pounds. Hung between the rods, being
suspended by piano wires as in a spider-web, was the motor, basket, and
propeller-shaft.

Prof. Lowe, in making a flight with a balloon,
from Cincinnati to North Carolina, which lasted
a day and all of one night, found that during the
early morning the balloon, for some reason, began
to ascend, and climbed nearly five thousand
feet in a few hours, and as unaccountably
began to descend several hours before he landed.

Now here is something I want you to remember. Never be guilty of going
to your engine in the morning and building a fire simply because you see
water in the glass. We could give you the names of a score of men who
have ruined their engines by doing this very thing. You, as a matter of
course, want to know why this can do any harm. It could not, if the
water in the boiler was as high as it shows in the glass, but it is not
always there, and that is what causes the trouble. Well, if it showed
in the glass, why was it not there? You probably have lived long enough
in the world to know that there are a great many boys in it, and it
seems to be second nature with them to turn everything on an engine that
is possible to turn. All glass gauge cocks are fitted with a small hand
wheel. The small boy sees this about the first thing and he begins to
turn it, and he generally turns as long as it turns easy, and when it
stops he will try the other one, and when it stops he has done the
mischief, by shutting the water off from the boiler, and all the water
that was in the glass remains there. You may have stopped work with an
ordinary gauge of water, and as water expands when heated, it also
contracts when it becomes cool. Water will also simmer away, if there
is any fire left in the fire box, especially if there should be any vent
or leak in the boiler, and the water may by morning have dropped to as
much as an inch below the crown sheet. You approach the engine and on
looking at the glass, see two or three inches of water. Should you
start a fire without investigating any further, you will have done the
damage, while if you try the gauge cocks first you will discover that
some one has tampered with the engine. The boy did the mischief through
no malicious motives, but we regret to say that there are people in this
world who are mean enough to do this very thing, and not stop at what
the boy did unconsciously, but after shutting the water in the gauge for
the purpose of deceiving you, they then go to the blow-off cock and let
enough water out to insure a dry crown sheet. While I detest a human
being guilty of such a dastardly trick, I have no sympathy to waste on
an engineer who can be caught in this way. So, if by this time you have
made up your mind never to build a fire until you know where the water
is, you will never be fooled and will never have to explain an accident
by saying, ‘I thought I had plenty of water.’ You may be fooled in
another way. You are aware that when a boiler is fired up or in other
words has a steam pressure on, the air is excluded, so when the boiler
cools down, the steam condenses and becomes water again, hence the space
which was occupied by steam now when cold becomes a vacuum.