Page:Popular Science Monthly Volume 91.djvu/91

 Do It With Tools and Machines

���A hook made of strong wire with a snap having a tem- pered steel tongue at one end is very handy for holding a paint bucket or fruit pail on a ladder rung

���The usual method of cutting the larger sizes of pipe on a lathe is improved upon by the use of the hand power threader illustrated above. It may be taken to the job

���An ordinary electric ceiling fan is kept running in this vestibule and when the outer door is opened the air is driven outward so swiftly that very few flies, if any, will be able to effect an entrance

��A portable electric- ally driven valve- grinder which gives the familiar oscilla- ting motion. The

����By changing the form of the interior bore of this anchor for a screw the max- imum expansion is given where the greatest frictional contact occurs, which increases the holding capacity

���A measuring gage using a fluid against a flexible diaphragm to obtain readings in ten thousandths of an inch or closer to determine the thickness of stock

��speeds of the elec- tric grinder are far greater than those attained by the hand method

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