- Software name: appdown
- Software type: Microsoft Framwork
- size: 646MB
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.
The term planing should properly be applied only to machines that produce planes or flat surfaces, but the technical use of the term includes all cutting performed in right lines, or by what may be called a straight movement of tools.
"About half-past-four. It must have been about that time, because just after I got back to my room the clock struck five. A motor car came up, one of the quietest I have ever heard. As the woman got in she stumbled, and the man swore at her. Then there was the strangest thing, the dull side of the motor car gleamed in places like silver, as if something had been rubbed off it by the woman as she fell. What do I think it was? Well, so far as I could make out, the car was all hung with black crape."His voice died away. The Curate was not actually shaking his head, but there was upon his features an expression of incredulity, the like of which the Doctor had not seen before upon a human face, for it was the incredulity of a man to whom all arguments against the incredible are in themselves unbelievable. It was a grotesque expression, and with it there went a pathetic fluttering of the Curate's eyelids, a twitching of his lips, a clasping of small white hands.
Balmayne murmured something more and closed his eyes. When the nurse came up to him an hour later he was dead. He had passed away quietly in his sleep. How he came by his death, and who his assailants were nobody knew. There were many dark passages in that dark life known only to itself and its Maker.