Sorry Russell, I looked up my bookmarks it was
Bull's impulse engine patent, not Brown's.
Here are a couple of links, see Bull's patent
and some tests etc on this page;

JLN Labs - Inertial Propulsion Engine
... systems which are automatically propelled by inertia forces"
FR2651279 by ... test run 1; The TIE pendulum test run ...
The Inertial Drive Engine Aircraft the IDEA V3.0 ...
http://jnaudin.free.fr/html/IPEmain.htm
(also see the "linear force machine" on this page,
very interesting...

And another interesting page;

... ITEM #AGN-104: THE BEST INERTIA ENGINE PATENTS & DATA. ...
overview of the types of inertia engines, methods ... models
suspended as a free pendulum with oscilloscope ...
http://www.padrak.com/agn/AGN4SALE.html

:o)
-Roman

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