INCANDESCENT LIGHTING 



ON 



ARC LIGHT CIRCUITS. 



THE BROWN AUTOMATIC CONVERTER 



will supply and take care of ten to twelve 16 c.p. incandes- 

 cent lamps at any point on an arc light circuit from an initial 

 current equal to a 2,oco c.-p. lamp of 9.5 ampere. 



Can be used with any make arc dynamo. 



Any number of lamps can be turned on or off without 

 affecting the rest. 



Invaluable to lighting companies as a means by which 

 they can secure customers, from one up, for incandescent 

 lighting anywhere on their circuit without involving the large 

 expense for incandescent lighting plants, or the necessity of 

 getting a large number of subscribers to commerce with. 



Address 



THE BROWN ELECTRIC COMPANY, 



400 Wood Street, Pittsburgh, Pa. 



GERMAN SIMPLIFIED. 



An eminently practical new method for learning the German lar- 

 guage. Edition ftr self-instructioD, in 12 Diimbeis, at 10 cents each, 

 sold separately ; school edition ^without keys), bourd in clo'h. $1.25. 

 For sale by all booksellers ; sent post-paid on receipt of pi ice by Prof- 

 A. KNOFLACH. 140 Nassau St.. New York. Prospectus mailed free. 



"IT STANDS AT THE HEAD. 



One touch of the finger should produce any character used 

 by the operator of a writing machine; instruments that fail to 

 accomplish this are deficient and do not fully meet the neces- 

 sity that brought them forth. These facts are self-evident. 



The No. 2 "Caligraph" is the only writing machine that 

 fully economizes time and labor, and economy of time and 

 labor is the best reason we know for soliciting trade. 



Granting that we are at the front in this, we can show that 

 our lately improved machines excel in mechanical merit, 

 durability and beauty of work. 



io,oco " CALIGRAPHS " ARE IN DAILY USE. 



We publish 400 letters from prominent men and firms which 

 are convincing. 



For specimens, etc.. address, 



THE AMERICAN WRITING MACHINE CO., 



HARTFORD, COJV -V. 



New York Office, 



23? Broadway. 



The Treasurer of the Science Company will in all cases send 

 a receipt for money paid to the publisher. 



MAGAZINES AND REVIEWS! ! 



Complete sets of all the leading Magazines and Reviews and 

 back numbers of several thousand periodicals, for sale at low 

 rates. Full files of Science, either bound or unbound, or odd 

 volumes and numbers supplied. Subscriptions taken on favorable 

 terms for any periodical either American or foreign. Address 

 THE AMERICAN AND FOREIGN MAGAZINE DEPOT. 

 47 Dey street, New York City. 



"THE ELECTRICAL REVIEW," 



Ahillustratedweeklyjournal.istheacknowledgcd lead- 

 er in the world of electrical science. Edited with care. 

 its editorial opinion is reliable.its news columns bright 

 and instructive. $3.00 per year; single copies, 10 cents. 



23 PARK HOW, NEW YORK. 

 (W~ Best advertising medium in the electrical field. 



IMPORTANT TO SUBSCRIBERS. 



The friends of SCIENCE can render valuable aid to the journal by 

 recommending it to possible new subscribers. Recognizing that such assist- 

 ance is of real value to us, we will, at any time, extend for six months the 

 term of a subcriber who sends us, with the money for one year's subscrip- 

 tion, a name not already on our list. 



Subscription price, $5.00 a year. To foreign countries, $6.00. Address 



" SCIENCE," 47 LAFAYETTE PLACE, NEW YORK. 



