Page:Popular Science Monthly Volume 91.djvu/414

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Do It with Tools and Machinery

���A radius gage for measuring the concave and convex surfaces of tools and dies. Instead of having small -leaves it has eight small blades

���A brick and concrete drill made of a steel tube or segment of pipe. It is cut off at an angle, as shown

��A lock washer which over- comes the loosening of nuts by vibration. It is made in hexagon shape

��An attachment for re- grinding thread - cutting dies of button type or lap- ping out holes in punches

���A new joist lifter. The handle is raised until the dog engages the tooth

��Daniel Boone up to date. When the fire will not start use the automobile pump

�� �