he propeller as the propeller turns
around. Then we gave up the Lewis above. It added more weight,
and we did not need it so much. The trouble with the Lewis gun is
that it has only ninety-seven cartridges, while the Vickers has
five hundred, and you can do just as much damage with the Vickers
as you could with them both.

_Senator Sutherland_: You drive and fight at the same time?

_Adjt. Prince_: Yes, sir.

_Adjt. Rumsey_: The machine gun is fixed.

_Adjt. Prince_: It is absolutely fixed on the machine, and if I
should want to adjust it to shoot you, I would adjust my machine
on you.

The witness then took up the nature and work of some of the heavier
machines. He testified:

_Adjt. Prince_: Then comes the artillery regulating machine. That
machine goes up, and it may be a Farman or a bi-motor, or some
other kind of heavier machine, a machine that goes slowly. They
go over a certain spot. They have a driver, who is a pilot, like
ourselves; then they have an artillery officer on board, whose
sole duty it is to send back word, mostly by Marconi, to his
battery where the shots are landing. He will say: "Too far," "Too
short," "Right," or "Left," and he stays there over this battery
until the work done by the French guns has been absolutely
controlled, and above him he has some of these battle planes
keeping him from being attacked from above by German airmen. Of
course, they may be shot at by anti-aircraft guns, which you can
not help. That is artillery regulating.

_The Chairman_: Are you always attacked from above?

_Adjt. Prince_: By airplanes; yes, sir. It is always much safer
to attack from above.

Then you have the bomb-dropping machines, which carry a lot of
weight. They go out sometimes in the daytime, but mostly at
night, and they have these new sights by which they can stay up
quite high in the air and still know the spot they are going at.
They know the wind speed, they know their height, and they can
figure out by this new arrangement they have exactly when the
time is to let go their bombs.

_Senator Kirby_: Something in the nature of a range-finder?

_Adjt. Prince_: A sort of range-finder.

_Adjt. Rumsey_: It is a sort of telescope that looks down between
your legs, and you have to regulate yourself, obser