HINTS TO CORRESPONDENTS. Names and Address must accompany all letters or no attention will be paid thereto. This is for our information and not for publication. References to former articles or answers should give date of paper and page or number of question. Inquiries not answered in reasonable time should be repeated; correspondents will bear in mind that some answers require not a little research and though we endeavor to reply to all either by letter or in this department each must take his turn. Buyers wishing to purchase any article not adver tised in our columns will be furnished with addresses of houses manufacturing or carrying the same. Special Written Information on matters of personal rather than general interest cannot be expected without remuneration. Scientific Americs.n Supplements referred to may be Books referred to promptly supplied on receipt of price. Minerals sent for examination should be distinctly marked or labeled. line equal to one-quarter a given circumference? ference cannot be exactly determined by geo circumference is equal to 0.7854 times the diameter. 2. What is the function of the globe on an open arc lamp A. The globe on an open arc lamp is useful in catching the pieces of hot carbon which are frequently pro jected from the lamp and which have been the be thrown and made to glide through the air a long distance and a stone may be made to stands up while in motion for the same reason. The larger the wheel the firmer it stands. Those who rode the old high wheels say that they were much more rigid against tipping over present time. 4. What would occur in the water column of a siphon if all atmospheric pressure were suddenly removed? A. If the pressure of the atmosphere were removed ing suction pump. If a siphon were running and the air pressure were suddenly removed the water would suddenly drop out of both legs the stream breaking at the top and falling down both sides. 5. Does not a voltaic current consist of two opposite charges
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