Teats with CFR and aircraft-type single-cylinder engines were made to investigate the progressive accumulation of load deposits on spark plugs under nonvarying operating conditions. Deposit-weight determinations and photographic observations are presented, which demonstrate the following characteristics of deposit accumulation:n1. Deposits accumulate at rates that decrease as the total weight of deposit increases.n2. The change in the rate of deposit accumulation with time may differ with different ergire operating conditions.n3. Deposits may change their positions on the spark plug during engine operation under the influences of gravitation and molecular forces and, possibly, forces arising from gas flow within the combustion chamber.
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