Scientific American Volume 65 Number 20 (November 1891) . lettersreceived and sent, and records of all kinds. Used bySci. Am. for letters received. Send for descriptive cir-culars. Address The Burr Index Co., Hartford, Conn. , Patent for Sale—Lightys Universal Needle Threader,see page 313. Right for entire United States or singleStates, except Illinois and Indiana. Sample, 35 solicited. ,Monticello, Ind. For Sale-The U. S. patent No. 440,9T1, or single Staterights on combined Pug Mill and Stone Separator (nocrusher). Will work clay from the bank and take outstone
Scientific American Volume 65 Number 20 (November 1891) . lettersreceived and sent, and records of all kinds. Used bySci. Am. for letters received. Send for descriptive cir-culars. Address The Burr Index Co., Hartford, Conn. , Patent for Sale—Lightys Universal Needle Threader,see page 313. Right for entire United States or singleStates, except Illinois and Indiana. Sample, 35 solicited. ,Monticello, Ind. For Sale-The U. S. patent No. 440,9T1, or single Staterights on combined Pug Mill and Stone Separator (nocrusher). Will work clay from the bank and take outstones as small as 3-16 of an inch. Address P. Stoerger,145 Wells Street, Chicago, 111. The Clarke Compound Engine, a description of whichwill be found on page 311, is patented in the U. S., Can-ada, and Europe, and rights are for sale by the James A. Clarke, New Westminster, BritishColumbia, Canada. D£F~Send for new and complete catalogue of Scientificand other Books for sale by Munn & Co., 361 Broadway,New York. Free on oiwies HINTS TO CORRESPONDENTS. Names and Address must accompany all letters,or no attention will be paid thereto. This is for ourinformation and not for publication. References to former articles or answers shouldgive date of paper and page or number of question. Inquiries not answered in reasonable time shouldbe repeated; correspondents will bear in mind thatsome answers require not a little research, and,though we endeavor to reply to all either by letteror in this department, each must take his turn. Special Written Information on matters ofpersonal rather than general interest cannot beexpected without remuneration. Scientific American Supplements referredto may be had at the office. Price 10 cents each. Books referred to promptly supplied on receipt ofprice. minerals sent for examination should be distinctlymarked or labeled. (3626) J. C. R. asks : 1. How much bi-chromate of potash will saturate a gallon of water ? ounc
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