Show device convert auto cylinder into air pump A new in dei ice that con can be screwed into the park spark plug ping liole hole of on one of 0 f the autos cylinder pt turns that at cylinder into an air pump that will produce two and a half entile feet of free air per minute tills much air ie Is lelent to ifray oil paint germicide cide insecticide and nd liquids fays says popular science monthly on the down domn stroke of the piston a the cylinder to which the device Is a fitted the piston bucke sucks in air through a caring operated valve on in the up stroke ahn alve closes and sla another other open opens allowing the air to flow into a storage tan tank k or into the pipe lending to the pray spray equipment lt more air ie Is needed it tian ail can be obtained from one cylinder in this tills way watt two of the devices can be used at the same time fo eo as its to double the output it Is resigned to work at tit an engine to a road speed of 1 20 0 miles an hour |