Scientific American Volume 77 Number 05 (July 1897) . Garvin Machine Co., Spring and Varick Sts., N. Y. Concrete Houses — cheaper than brick, superior toBtone. Bansome, 757 Monadnock Block, Chicago. For static machines for all purposes, and X ray appa-ratus, write Reedsburg Electric Mfg. Co., Reedsburg,Wis., U. S. A The Norwich Line—Inside route between New York,Boston, and Worcester. Leave Pier 40, North River,5:30 P. M., week days only. Machinery manufacturers, attention! Concrete andmortar mixing mills. Exclusive rights for Bale. Ran-some, 757 Monadnock Block, Chicago. The celeb
Scientific American Volume 77 Number 05 (July 1897) . Garvin Machine Co., Spring and Varick Sts., N. Y. Concrete Houses — cheaper than brick, superior toBtone. Bansome, 757 Monadnock Block, Chicago. For static machines for all purposes, and X ray appa-ratus, write Reedsburg Electric Mfg. Co., Reedsburg,Wis., U. S. A The Norwich Line—Inside route between New York,Boston, and Worcester. Leave Pier 40, North River,5:30 P. M., week days only. Machinery manufacturers, attention! Concrete andmortar mixing mills. Exclusive rights for Bale. Ran-some, 757 Monadnock Block, Chicago. The celebrated Hornsby-Akroyd Patent Safety OilEngine iB built by the De La Vergne Refrigerating Ma-chine Company. Foot of East 138th Street, New York. The best book for electricians and beginners in elec-tricity 1b Experimental Science, by Geo. M. mail, $4. Munn & Co., publishers, 361 Broadway, N. Y. %W~ Send for new and complete catalogue of Scientificand other Books for sale by Munn & Co., 361 Broadway,New York. Free on »l£S HINTS TO CORRESPONDENTS. Names and Address must accompany all lettersor no attention will be paid thereto. This is for ouiinformation and not for publication. References to former articles or answers shouldgive date of paper and page or number of question. Inquiries not answered m reasonable time shouldhe repeated : correspondents will bear in mind thatBorne answers require not a little research, and,though we endeavor to reply to all either oy letteror in this department, each must take his turn. Buyers wiBbing to purchase anv article not advertisedin our columns will be furnished with addresses ofhouses manufacturing or carrying the same. 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 sh
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