Page:Popular Science Monthly Volume 90.djvu/397

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Placed in the Hands of the Mechanical Workers

���Above: A soldering apparatus in which the current employed passes through the sol- der being used. The circuit is broken when the solder is removed so that none is wasted

��Below: Flexible sheet- metal belting made up of a series of sheets linked together. They are easily detached

����At left: A machine- tool which cuts dupli- cate keys from originals in a minute or less. The key to be duplicat- ed is placed in the lower vise and the blank key in the upper vise

��Below: A tool which can be adjusted to cut round holes of various sizes. It is operated by a ratchet-wrench

���A six-pronged rack which enables a man to elevate a barrel in three different po- sitions for drawing the contents. It is also used in loading and unloading freight

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