Do It with Tools and Machines— a Baker's Dozen of Efficiency Devices for the Mecha- nic and Factory Man
��An especially constructed frame for holding canvas which pro- tects persons from flying bits of pavement blocks or other stone
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��This counter attach- ed to a machine ac- curately records the parts turned out
��In the upper circle, an ar- rangement which enables a one-armed man to pick up nails with a magnetic hammer
Below, a clamp to hold a diamond cutter for truing emery wheels
��This model maker's lathe which is driven by motor, is fitted with necessary attachments for making fine phonograph needles
��Device for forcing a steel ball into metal to test the hardness of steel
����A chain drag used by an industrial school for rimning shucks and ensi- lage into a silo. It is run by a belt from a motor or a gasoline engine
��At the left, n trnilcr factory truck in which the front wheel attached to a handle, disconnects and can be used on any number of trailers
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