** Introduction:**
The mechanical generation of a unidirectional force, is shown to be a consequence
of the variable inertia property of matter.

** The Linear Force Machine:**
A series of experiments

There are many ways to control inertia of objects,
but all of them are based on the primary interaction of rotation and inertia.
The simplest manifestation of the phenomena is the rotation of a spherical
material object. Depending on the speed of rotation, the inertial
mass of the object will vary as the square of its rotational velocity.
The ratio of inertial to gravitational mass may be found by pendulum experiments.
This ratio is defined as the OD number, this quantity having found to be
dependent on the angular velocity of rotation of the test object, its composition
and geometry, and the value of linear acceleration which is applied to
the rotating object to test for inertial mass. All things considered
then:

__
inertial mass __
^{
N}od = gravitational mass

For the simple spherical metallic object, the
spinning ball, the od number may reach factors of five or so as the rotational
speed is increased to the point where the object will explode, i.e. 50,000
rpm for a 1 inch steel ball bearing. For practical controllability
of inertia, larger inertial variations must be created and be subject to
control other than the rotational acceleration of a test object to 50,000
rpm and then back to zero again as part of a cycle.

A much more powerful interaction takes place
through the precession of a constrained spinning gyroscope. The ratio,
inertial/gravitational mass, of a constrained spinning gyroscope can easily
reach a factor of several hundred, depending on the velocity of precession
and the rotational speed. N_{od} is, (at least) a function of the
square of the precessional velocity. That is:

N_{od}
(precession) = Kv^{2}W^{2}
+ 1
Where **v** = gyro angular velocity

___________________________
and **W** = angular velocity of gyro precession

** K**
is a geometrical and physical constant.

A suitable mechanism for the demonstration of
the unidirectional force is a mechanical arrangement based on the __force__
__machine__. A force machine, c.f. figure (1), is a combination
of two mechanically identical gyroscopes, rotating coplanar and with parallel
axes, in opposite directions at equal angular velocities. Such a
device allows us to study the properties of rotation without interference
from gyroscopic torques.

Since inertia is isotropic, it is clear that
inertial changes engendered from procession are reflected in linear inertial
changes as well. A sequence of operation is indicated. Consider
the energized (gyros turning) force machine. The machine is pushed
away from the experimenter in the low inertia (no precession) condition.
When the machine is pulled back, however, the gyros are precessed at some
angular velocity **W**. The
condition of precession multiplies the inertia of the rotating gyroscopes
by a factor of several hundred times. This is reflected linearly
and presents a strong resistance to the force exerted by the experimenter
attempting to return the machine to its original, (near) position.

A combination of linear and torsional oscillations,
(the latter at ^{1}/_{2}
the angular frequency of the former), will produce a unidirectional reaction
force in the direction of linear oscillation of the energized force machine

A phase diagram showing the relationship of
the linear velocity to torsional oscillation and the direction of net momentum
flow, appears in figure (2). A combination of mechanical linkages
to accomplish this effect in a rapid cyclic manner is shown in figure (3).
The resultant momentum flow is a product of N_{od} (precessional)
f(t) and v(t) (linear motion), and represents the unidirectional reaction
force.

The machine of figure (3) has been constructed
in our laboratory and delivers unidirectional reaction force in the pulsating
manner expected. The device is called a __Linear__ __Force__
__Machine__.

** Inertial Mechanics:**
The field of inertial mechanics refers to that class of mechanical experiments
wherein inertia becomes a variable. Although the mechanical force
machine demonstrates the usefulness of the variable inertia concept in
the generation of a unidirectional force; there are several reasons why
such a machine stands in relation to its ultimate form in the same wise
as the early rotating mechanical radio frequency generators stand in relation
to the modern high power vacuum tube or transistor radio frequency power
oscillators. In the first place the delivery of force or momentum
impulses is in a pulsating manner. It would be highly desirable to
have the delivery of force or momentum in a steady manner. Secondly,
the necessity of maintaining the condition of energization of the force
machine requires a steady high speed rotation of constrained gyroscopes.
As well as the necessity for the supplying of the rotational excitation
via electric motors or mechanical gearing, the necessity for sturdy bearings
to support the gyros under intermittent reciprocating precessional torque
reactions. The fact that these are problems of a conventional sort,
which can be easily solved through accessible bearing technology, does
not mitigate against the search for a more desirable rotational-inertial
interaction.

In the linear force machine thus far described,
the form of the motion imparted to the force machine, is called "three
dimensional". The form of motion where driven precession is coupled
with linear oscillation is called "streptation", a derivative of the Greek
word for __twisting__.

What is desired is a mode whereby streptoid motion can be achieved without mechanical linkages and reciprocation. Such a machine would achieve the generation of unidirectional force without pulsation.

** Inertial Drive:**
The ideal inertial drive would achieve a smooth flow of momentum in a desired
direction with the resultant reaction force of steady and constant magnitude.
The method of accomplishing this result is through a heretofore unrecognized
magnetic interaction. With reference to figure (4) we observe a rod
of medium hard magnetic material suspended within the gap of a permanent
magnet. The length to diameter ratio of the magnetic core determines
the dimensions of the magnetic gap. From the front to rear of the
machine the magnetic gap is twisted 180 degrees. The magnetic core
is suspended on bearings designed to withstand whatever thrusts are generated
by the machine.

Within the gap of the permanent magnet the magnetic
induction is maintained such that the magnetic core is saturated under
all conditions of operation of the machine. Under such conditions the external
magnetic field maintains alignment of the magnetic dipoles within the material
such that no projections of internally generated torque vectors, produced
by rotation of the magnetic core within the gap, can appear in the drive
axis. This is the familiar disappearance of hysteresis torques under
saturation conditions, and represents the condition of constraint of a
rotating gyroscope.

Motion of a magnetic material in a magnetic
field sufficient to cause saturation elicits the identical inertial properties
that have been found in rotating real mechanical objects. What is
necessary is to obtain the streptoid three dimensional motion in order
to elicit the unidirectional force. This is simply accomplished by
twisting the magnetic gap so that in rotation the magnetic dipoles within
the core material are both twisted and translated. The combination
of twisting and unidirectional translation is simply accomplished by rotating
the magnetic core.

In like manner to the precession torques of
rotating gyroscopes, the hardness of the magnetic core material will determine
the strength of the interaction. The ultimate force handling capacity
of the machine will be limited by the demagnetization of the rotating core
through inability of the external field to maintain constraint over the
magnetic dipole interaction.

The machine of figure (4) becomes a fundamental drive unit, capable of generating a thrust against "space" itself, and thus may replace all earlier methods of generating unidirectional motion, i.e. gears wheels transmission units for road travel, and propellers and jets for airborne vehicles.

** The Mass Field Effect:**
The ability to enhance the inertia of a rotating object controllably makes
for the possibility of controlling the flow of inertia. The mass
field or OD field represents the possibility of storing energy in the inertial
property of space. That this has been shown as a field which exists
is the result of our prior experiments. Now the possibility of a
directional flow of that inertia, the mass field, exists as a concomitant
of the operation of the linear force machine. A directed mass field
flow can have useful mechanical applications.

** The Hydrogen Fusion Reaction:**
Although it is cloaked in many mysterious terms relating to the properties
of nuclear plasmas, the fusion of hydrogen to helium is nothing more than
another form of burning or combustion which can only take place under conditions
found in the interior of stars. Creation of such a condition here
on Earth entails the creation of a region of space, a "bottle", wherein
the proper temperature and conditions for such a reaction are maintained.
At a temperature of l0

Prior attempts to contain the reaction through
electric and magnetic interactions with the charged plasma have failed
through the inability to generate sufficient forces for containment.
Although at present, it is just an experimental possibility, it is suggestive
to consider a containment region maintained through the mass field flow
of a suitable number of linear force machines arranged geometrically with
their force vectors convergent to delimit the reaction region.

** Mass Field Flow:**
When an OD or mass field is created, its first order effect is to enhance
the inertia of material objects immersed within the active region.
Momentum can also be transmitted through a mass field, and this is responsible
for the conundrum of a "mass field flow".

In general we associate a flow with the movement
of material. The flow of momentum associated with the mass field
of a linear force machine, is, a directed flow of inertia which acts to
produce a linear force on mass particles immersed within the field.
The resulting flow which takes place, is described by the motion of test
mass particles. Thus, although the mass field does not itself flow,
test particles immersed within it are acted or by forces which cause motions
similar to those of the fluid flow in liquid and gasses.

On the basis of this analogy we can see how a region of containment can be created by the geometrically symmetrical and radially inward convergence of directed mass field flow. In many respects the magnetic core of a linear force machine resembles an antenna whose directivity is a function of the length to diameter ratio of the rotating member. If this relationship holds true, it is suggestive to consider the degree of focusability of these beams and the attractive and repulsive forces which may be set up in a properly directed array. The potentialities of these arrangements need to be explored in every possible detail in view of the possible vital payoff in terms of the controlled fusion reaction. Other possibilities of controlled and directed mass field flow are left to the imagination of the observer.

** Conclusion:**
The linear force machine, as a mechanical prime mover, replaces gear trains,
propellers and jets, as a device for the generation of thrust with one
moving part, and the polarity of thrust determined by the sense of input
shaft rotation, this machine becomes a fundamental tool of our civilization.
In degree of sophistication, this machine represents the level of scientific
inquiry of our society. The forces which use and make ready this
device for the benefit of society, will have at their disposal a tool of
unprecedented force and power. The use of this machine to enable
the controlled thermonuclear fusion reaction will inaugurate a new dawn
of civilized society on this planet, and will inaugurate the entrance of
Man into interplanetary space and ultimately the stars.

22 April 1974

__Bruce E. DePalma__

b) __The Force Machine Experiment__
9 January 1973

c) __The OD Effect - A New Physical Phenomena__
9 June 1973

d) __The OD Effect - Radio Frequency Shift
Expt.__
17 June 1973

e) __The Effect of Gravity on Rotating Objects__
18 March 1974