Use of lead.—What is a lead used for in adjusting the fit of a brass to its journal? [II. 386].

Fit of top brass.—When a liner is used between the two brasses, what does the fit of the top brass depend upon? [II. 386].

Oiling.—In oiling the engine, what precaution would you take to prevent the journals from heating? [II. 401].

Cold weather.—What is liable to happen to an engine that is used out of doors in cold weather? [II. 386].

Leaky throttle valve.—What damage might a leaky throttle valve do, and how would you prevent it? [II. 386].

Leaky check valve.—What damage may a leaky check valve do, and how would you prevent it? [II. 387].

Freezing in the pump.—How would you prevent the water from freezing in the pump? [II. 387].

Freezing oil.—How would you prevent the oil from freezing? [II. 387].

Thawing oil.—How would you thaw frozen oil? [II. 387].

Setting a portable engine.—How should a portable engine stand when it is at work, and why should it stand so? [II. 387].