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TWO:In multiplying the variations of a measuring implement by mechanism, it is obvious that movable joints must be employed; it is also obvious that no positive joint, whether cylindrical or flat, could be so accurately fitted as to transmit such slight movement as occurs in gauging or measuring. This difficulty is in most measuring instruments overcome by employing a principle not before alluded to, but common in many machines, that of elastic [151] compensation.The Germans had flung some more bridges across the river beyond Andenne, which had been used for the occupation of Namur chiefly, and lay idle now guarded by only one sentry. I left by the town-gate without any difficulties; the German soldiers jumped out of the way and stood to atten153tion, as soon as they noticed the Netherland flag flying at the front of the motor. To the right and the left of the gateway they had written in gigantic letters: "Newspapers, please!"

Distillation equipment01

Distillation equipment02

THREE:
FORE:The same, in self-same place, and by itself"But really, madame, that is only senseless gossip of the people. You need not be afraid, the Germans will not be so cruel as all that!"

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FORE:CHAPTER XLVII. FLOWN.A book containing the pattern record should be kept, in which these catalogue numbers are set down, with a short description to identify the different parts to which the numbers belong, so that all the various details of any machine can at any time be referred to. Besides this description, there should be opposite the catalogue of pattern numbers, ruled spaces, in which to enter the weight of castings, the cost of the pattern, and also the amount of turned, planed, or bored surface on each piece when it is finished, or the time required in fitting, which is the same thing. In this book the assembled parts of each machine should be set down in a separate list, so that orders for castings can be made from the list without other references. This system is the best one known to the writer, and is in substance a plan now adopted in many of the best engineering establishments. A complete system in all things pertaining to drawings and classifications should be rigidly adhered to; any plan is better than none, and the schooling of the mind to be had in the observance of systematic rules is a matter not to be neglected. New plans for promoting system may at any time arise, but such plans cannot be at any [87] time understood and adopted except by those who have cultivated a taste for order and regularity.

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FORE:Fifth.Shrinkage; the allowance that has to be made for the contraction of castings in cooling, in other words, the difference between the size of a pattern and the size of the casting. This is a simple matter apparently, which may be provided for in allowing a certain amount of shrinkage in all directions, but when the inequalities of shrinkage both as to time and degree are taken into account, the allowance to be made becomes a problem of no little complication.

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