rded for his efforts by the sound of
explosions from the engine, was ready to give the carriage an indoor
trial. Standing astraddle of the reach and facing to the rear, he spun
the flywheel with both hands, taking care not to get his hands caught
between the wheel and the frame. His efforts were in vain, as there was
complete failure to obtain ignition. He then made a new ignition tube,
nearly twice as long as the original 4-1/2-inch tube, and turned down
its wall as thin as he thought safety allowed. The thinner wall did not
conduct the heat off so rapidly and thus kept the tube hot enough to
permit ignition. After this slight change, he was able to get a few
occasional explosions but he does not now believe that the engine ever
operated continuously. Each explosion was accompanied by a loud knock,
due, undoubtedly, to the movement of the free piston. Had the engine
operated continuously, it is likely that the action of the free piston
would have shortly wrecked the engine. Further efforts appeared
unwarranted until alterations could be made.

= ALL AGREEMENTS CONTINGENT UPON STRIKES, ACCIDENTS AND OTHER CAUSES
BEYOND OUR CONTROL

CABL ADDRESS "MOTODURYEA," PHILADELPHIA WESTINGHOUSE AND W. U. CODES

DURYEA LABORATORIES CHAS. E. DURYEA, CONSULTING
ENG'R
WE SOLV MECHANICAL AND OTHER PROBLEMS TESTS, SEARCHES, OPINIONS,
EXPERT IN PATENT SUITS.
DEVELOP INVENTIONS, ASSIST INVENTORS 35 YRS EXPERIENS. HEATING,
GAS ENGIN, AUTO, ETC.
FOR THINGS TO MAKE OR SEL CONSULT US A PRIDEWORTHY RECORD OF
THINGS ACCOMPLISHT

PHILADELPHIA, PA.
3528 N. 18TH ST.

Dear Mr Mitman 24 Nov 1920

On the train I had some time to puzzle over that car. Been working
nights to make up time lost in the day so did not hav much.

I made a sketch for you but did not show the spring that holds the
circuit breaker in contact with the spark point. That thin finger was
part of it. A spring was wound spirally--not helically--around the
projecting end of the breaker pivot and the end of the spring hookt over
the thin finger. See sketch herwith.

Just how the central end of the sprin