SCIENCE. 



111 



JEWETT'S 



Portable Crock Filter 



nil. Nov. 16, 1S69, Oct. 15, ISIS. 



Patent Pending. 



The Latest Improvement 



consists in placing the filtering material 

 in a separate vessel or crock. The ad- 

 vantage being this, viz ; 



That whenever the filter part gives 

 out, a new crock can be obtained, which 

 will make the whole complete as when 

 first purchased. We, thertfore, recom- 

 mend parties at a distance (instead of at- 

 tempting to get the Filter re-packed) that 

 they should purchase a new filter crock, 

 the cost of which is moderate, and no 

 more than the cost of repacking. 



ORNAMENTAL STYLE. 



No. 71, Porcelain Reservoir, 4% quarts $7-25 each. 



72. 

 73. 

 74, 

 75. 



1% 

 11 



16 

 26 



9.25 

 11.00 

 13.00 

 15-5° 



The Original and Genuine. 



ALL OTHERS ARE IMITATIONS. 



Over 100,000 now in use, 



Acknowledged the only complete Filter 

 \nd Cooler in the world. 



JEWETT'S 



PORTABLE CROCK 



FILTER 



WITH PORCELAIN- LI NED 



COOLER. 



This is the only Filter h»ving the Pat- 

 ent Removable Filtering Cup attached, 

 which holds all sediment that would oth- 

 erwise pass into the filter. 



This celebrated F.lter will take river, 

 lake, pond, rain or other impure water, 

 and render the same of 



Sparkling Transparency 



and Purity. 



STAINED OAK. 



4& quarts ... ... $6.75 each. 



i-75 

 10.50 

 12.50 

 15.00 



READ THE TWO MOST CONVINCING TESTIMONIALS. 



Isaac S. Williams & Co., 728 Market Street, Philadelphia, Pa.— We have sold your "Patent Water Filter" for the last sie years. Our sales 

 ni that time having reached upwards of five thousand, and in no instance have we heard ot any failure in performing all you claim for them. 



BOARD OF HEALTH, Washington, D. C.,Aug. 37, 1877. 

 Webb & Bever:oge: — I am just in receipt of your favor of yesterday, requesting my opinion of the " Jewett Filter" purchased of you sev 

 «ral months ago lor my personal use, and am pleased to say that it has fully answered your expiessed estimate of its value. As a cleanser and 

 purifier of drinking water it is certainlv not excelled by any mechanical arrangement known to me. The foregoing remarks APPLY equally 

 »c the largk Filter of the same make purchased for the Board of Health. 



Very respectfully yours, CHRIS. C. COX, M. D. 



Manufactured only by JOHN C. JEWETT & SONS, Buffalo, New York. 



n>R Sale in New York City uy KING. BRIGGS & CO., 596 Broadway. J. H. BALDWIN & CO., 21 Muiray Street. L. HEYNIGER, 



18 Fulton Street. CHARLES JONES, 020 Broadway. LEWIS & CONGER, 601 Sixth Avenue. 



SCIENCE 



-A. WEEKLY JOURNAL OF SCIENTIFIC PROGRESS 



Vol. II. No. 40, April 2, 1881. 



CONTENTS. 



>f James Smithson (Edit.) ; On the Amplitude of Vibration of Atoms, by Prof. A. E. Dolbear ; Marsh's Odontor- 

 ithes, by Prof. Burt G. Wilder ; On the Southern Stars and other Celestial Objects, by J. H. Pope; Scientific 

 looks ; The Glycerine Barometer ; Books Received ; Notes, Astronomical, Chemical, Microscopical, etc., etc., etc. 



Subscription, Four Dollars a Year. 



Single Numbers, Ten Cents. 



