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ENGLISH 香京理疗3. The course or direction of transmission, whether in straight lines or at angles.The lifting strain at the front end of a platen is of course increased as the height at which the cutting is done above its top, but this has not in practice been found a difficulty of any importance, and has not even required extra length or weight of platens beyond what is demanded to receive pieces to be planed and to resist flexion in fastening heavy work. The reversing movement of planing machine platens already alluded to is one of the most complex problems in machine tool movement.
"But that is a weapon, general!"Nearly every hour another proclamation was posted; and this made the people still more nervous. One of them brought the information that the province of Lige had to pay a war-tax of fifty million francs. Another forbade the people to be out in the streets after six o'clock p.m.; the doors must remain open, the windows show the lights. Burning and shooting were threatened if any more arms should be found, and all houses were to be searched.To urge the necessity of learning practical fitting as a part of an engineering education is superfluous. A mechanical engineer who has not been "through the shop" can never expect to attain success, nor command the respect even of the most inferior workmen; without a power of influencing and controlling others, he is neither fitted to direct construction, nor to manage details of any kind connected with engineering industry. There is nothing that more provokes a feeling of resentment in the mind of a skilled man than to meet with those who have attempted to qualify themselves in the theoretical and commercial details of engineering work, and then assume to direct labour which they do not understand; nor is a skilled man long in detecting an engineer of this class; a dozen words in conversation upon any mechanical subject is generally enough to furnish a clue to the amount of practical knowledge possessed by the speaker.
On the same day I wrote as follows about Dr. Goffin:But because the German libels go on accusing the Belgian people of horrible francs-tireurs acts, I have thought that I ought not to wait any longer before giving my evidence to the public.
Platens as a rule run back at twice the forward or cutting movement, and as the motion is uniform throughout each stroke, it requires to be stopped at the extremes by meeting some elastic or yielding resistance which, to use a steam phrase, "cushions" or absorbs the momentum, and starts the platen back for the return stroke.Vis had not been burnt yet, as had been reported in The Netherlands. Only here and there had the shells done some damage, and hundreds of window-panes had been burst by the vibration of the air. As a token of submission to the invader, small white flags hung from all the windows, and these, along the whole length of a street, made a decidedly lamentable impression.
I met a doctor at this nunnery, who told me highly important news, but in whispers, because in these days "even walls have ears": the Allies had gained great victories over the Germans. As he saw by the expression of my face that I did not believe off-hand all he told, he became still more impressive in manner, and produced a paper, from which he recited:Reviewing these mechanical conditions, we may at once see sufficient reasons for the platen movement of planing machines; and that it would be objectionable, if not impossible, to add a traversing or cutting action to tools already supported through the medium of eight joints. To traverse for cutting would require a moving gib joint in place of the bolted one, between the standards and main frame, leading to a complication of joints and movements quite impracticable.
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"Wait! wait! wait!"In making notes, as much as possible of what is written should be condensed into brief formul?, a form of expression which is fast becoming the written language of machine shops. Reading formul? is in a great degree a matter of habit, like studying mechanical drawings; that which at the beginning is a maze of complexity, after a time becomes intelligible and clear at a glance.
Keeping these various points in mind, an apprentice will derive both pleasure and advantage from tracing their application in steam-hammers, which may come under notice, and various modifications of the mechanism will only render investigation more interesting.
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