I am afraid you will conclude that I am not very anxious for a tandem after all, since I have let nearly a week pass without answering your letter in regard to the kind of wheel I should like.
It was a calm; so, forming a tandem of three boats, we commenced the slow business of towing the trophy to the Pequod.
Steam at high pressure exhausting into the atmosphere is still commonly used, but the great power required for raising heavy loads from deep pits at high speeds has brought the question of fuel economy into prominence, and more economical types of the two-cylinder tandem compound class with high initial steam pressure, superheating and condensing, have come in to some extent where the amount of work to be done is sufficient to justify their high initial cost.
Typically they are steam pumps, the steam and water cylinders being set tandem on the same bed frame, generally without fly-wheel or other rotary parts; they may be single cylinder or duplex, simple, compound or triple expansion, and having a higher speed of stroke are smaller in all their parts than Cornish pumps.
They moved in tandem without looking at each other, their movements controlled and efficient.