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As the stay-at-home mom, I am drawn rapidly into Riley''s new interest. And after a brief initial hesitation, I plunge willingly and headlong into the world of the construction site. Riley''s excitement is infectious, and I find myself making detours so we can watch a forklift or excavator at work. In the car, he practically levitates out of his seat with joy when we pass a backhoe. "Mo''! Mo''!" he shouts. I try to explain that I can''t conjure earthmovers at will. But I suspect he thinks I''m being stingy. We buy a toy dump truck at a yard sale, and a relative in Illinois sends a nifty scale model of a John Deere tractor wheel loader.

Low-hydrogen types. These basic-coated electrodes, EXX15, EXX16, EXX18, EXX28, and EXX48, are formulated with low moisture-retaining coatings and manufactured to contain low levels of hydrogen. Hydrogen-controlled electrodes minimize risk of hydrogen-induced cold cracking when welding high-tensile steels on restrained structures. Fabricators use these electrodes to reduce or avoid the need for pre- or postweld heat treatment to drive hydrogen from weld metal. Weldmetal diffusible hydrogen content varies from 1 to 16 ml/100 g. Optional designators H16, H8, and H4 set decreasing limits on hydrogen content in deposited weld metal. An optional electrode designator, ''R'', indicates an electrode that is moisture resistant; it will not absorb water in excess of a specified limit after exposure to humidity. Low-hydrogen electrodes should be used in dry condition and may require baking after exposure to the atmosphere.