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THREE:Politeness is as indispensable to a learner in a machine shop as it is to a gentleman in society. The character of the courtesy may be modified to suit the circumstances and the person, but still it is courtesy. An apprentice may understand differential calculus, but a workman may understand how to bore a steam cylinder; and in the workman's estimation a problem in calculus is a trivial thing to understand compared with the boring of a steam engine cylinder. Under these circumstances, if a workman is not allowed to balance some of his knowledge against politeness, an apprentice is placed at a disadvantage.Some uphold the accusation on the ground of expressions in Belgian newspapers, collected in a German pamphlet. In my opinion these quotations have not the slightest value. Everyone will understand this who thinks of the excitement of journalists, whose country was suddenly and quite unexpectedly involved in a terrible war, and who felt now that as journalists they had to perform a great, patriotic duty. In their nervous, over-excited condition they sat at their desk and listened to the gossip of refugees about civilians taking part in the struggle. In their imagination they saw hordes of barbarians overrun their native soil, saw man and man, woman88 and woman, shoulder to shoulder, resisting the invader without regard for their own life. The thoughts of such journalists, whose very own country had been at war now for a few days, were not on severe logical lines; they found a certain beauty in that picture, and I can quite understand how some came to believe in it as a reality, and gloried in it.

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THREE:There is, however, a principle in hydraulic machinery that must be taken into account, in comparing it with positively geared mechanism, which often leads to loss of power that in many cases will overbalance any gain derived from the peculiar action of hydraulic apparatus. I allude to the loss of power incident to dealing with an inelastic medium, where the amount of force expended is constant, regardless of the resistance offered. A hydraulic crane, for instance, consumes power in proportion to its movements, and not as the amount of duty performed; it takes the same quantity of water to fill the cylinders of such cranes, whether the water exert much or little force in moving the pistons. The difference between employing elastic mediums like air and steam, and an inelastic medium like water, for transmitting force in performing irregular duty, has been already alluded to, and forms a very interesting study for a student in mechanics, leading, as it does, to the solution of many problems concerning the use and effect of power.Having heard their own engine, the pilot of the seaplane had decided to risk a dash out of the fog and to try to escape.

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