Melon baller. A kitchen implement with a wooden handle with a small sharp edged bowl at one end. This is used to scoop ball shapes from, particularly, melons but can also be used for other similarly textured foods such as cucumber. Larger ones are used for ice cream.
"Raising powder." Raising agent used to make a baked mixture light. It may be baking powder consists of bicarbonate of soda (US: baking soda) and cream of tartar mixed with flour or starch.