A maid feeding young children. The boy drinks from a cup and is watched by a dog. The maid holds a spoon…
"Method of drying out a generator by short-circuiting the armature leads through a water rheostat."…
This is an illustration of a baseball game. Baseball is played on a large field that has four bases…
"Configuration used to wash out a radiometer using oxygen. A, bulb containing perchlorate of potash;…