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The pictures reproduced here are taken from the film « Technik der Welt », made at the Leipzig Technical Fair. Figure i, shows the machine in its complete construction. The special advantages of this machine are emphasized by arrows, indicating that the crank shaft has threefold supports, whereby inaccuracies resulting from vibrations or jerks are eliminated. Further, especially when illustrating machines of recent type, it wouid be necessary to indicate the driving centre and the gear because they are exceedingly important of the use of the machine and, consequently, for running costs.
If machines or instruments are so complicated that the construction and details cannot be shown by ordinary pictures, it is advisable to use the schematic reproduction of the chief parts. Either drawings or model
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tricks may be used to show the machine while it is, so to speak, in the making. A model is gradually built up from its details to show the whole construction of the machine.
The functioning of machines, instruments and tools may be shown in several different ways. In the case of tool making machines, the raw piece may be shown before it is placed in the machine, again during the process, and finally the complete product.
Enlarged views of the workrooms make it possible to show more ciearly the functioning of the machines, for instance the production and also the shape of the shavings to which greater attention has recently been given when observing the functioning of machines.
In the case of heavy engines most of the work is done inside the interior parts, which makes it invisible as an ordinary film objective. In order to show such processes, it will be necessary to make models worked by a separate drivng force. Figure 5 shows this form of reproduction in a double