is right? A. Every physical part of any solid body turning upon an axis or center moves; but the axis or center being an imaginary line only is not supposed to turn. There is a quibble in the argument which we think you will be able to divide with your friend. 2. How long does it take the planet Jupiter to makes revo lution around the earth? A. The earth revolves to the same relative position in regard to Jupiter and the sun in about 398 days. 3. How long does it take Venus to make a revolution around. the earth? A. Venus does notrevolve around the earth but swings apparently like a pendulum across the heavens as it revolves around the sun in an orbit inside the earth's orbit. It becomes evening star or comes to the same position in from corroding. I have seen in your paper a prescription for that purpose but have forgotten what it was. The boiler is new and I want to keep it clean. A. If you are cock. Clean out by washing and scraping once a month or once in two months if there is but little incrusta tion. Put into the boiler a day before cleaning about one quart of tanner's liquor or a strong decoction of tan bark oak or hemlock per horse power. If this is not to be had then use one half pound caustic soda or potash to the horse power. Dissolve the soda or potash ing will dissolve and crack off the scale so that the boiler can be readily wasbed out. If you are using water that is considered soft such as creek or river water you may not need one-half the above quantity or possibly nothing but thorough washing out every two or three months. ing tools. More skill is required in the working hard ening. and tempering tools than falls to the lot of most machine shop blacksmiths. It is not advisable to put into the shop two or three brands of tool steel that large cog wheel to be operated by a smaller wheel and a crank turned by hand. The large one to have attached or two man power. Please inform me what must be the circuniference weight and number of cogs in large and s
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