\' 



SCIENCfi 



[Entered at the Posi-OflBce of New York, N.Y., aa Second-Class Matter.] 



Ninth Year. 

 Vol. XVIII. No. 440. 



NEW YOKE, July 10, 1891. 



Single Copies, Ten Cents. 

 $3.50 Pee Year, in Advance. 



of Protecting Property 

 from Lightning. 



The Lightning Dispeller. 



The Patent Lightning Dispeller is a conduc- 

 tor specially designed to dissipate the energy 

 of a lightning discharge, — to prevent its 

 doing harm, — placing something in its path 

 upon which its capacity for causing damage 

 may be expended. 



No recorded case of lightning stroke has 

 yet been cited against the principle of the 

 Dispeller. So far as known, the dissipation 

 of a conductor has invariably protected under 

 the conditions employed. 



Correspondence solicited. 



AGENTS WANTED. 



N. D. C. HODGES, 



47 Lafayette Place, - - New York. 



J. B. CRALLE & CO., 

 Washington, D. C. 



ILLUSTRATED HANDBOOK FREE upon applica- 

 tion. Mention this paper. 



ESTERBROOK'S 

 STEEL PENS. 



Of SUPERIOR AND STANDARD QUALITY. 

 Leading Nos,: 048, 14, 130, 135, 239, 333' 



For Sale by all Stationers. 



THE ESTERBROOK STEEL PEN CO., 



Works: Oamden, N.J. '^6 John .St.. New York. 



THE 



COMPANY. 



95 MILK ST., BOSTON, MASS. 



This Company owns the Letters 

 Patent granted to Alexander Gra- 

 ham Bell, March 7th, 1876, No. 

 174,465, and January 30, 1§77, 

 No. 186,7§7. 



The Transmission of Speech by 

 all known forms of ELECTRIC 

 SPEAKING TELEPHONES in- 

 fringes the right secured to this 

 Company by the above patents, and 

 renders each individual user of tel- 

 ephones, not furnished by it or its 

 licensees, responsible for such un- 

 lawful use, and all the conse- 

 quences thereof and liable to suit 

 therefor. 



MIMCQAIC i-'ABiNET Specimens. Collections. 

 Ill I II L n n LO • For Blowpipe Analysis. 



Largest and finest stock in U. S. 100pp. Illustrated 

 CatalOBue. paper bound, 16o ; cloth bound, 25c. 



GEO. L. ENGLISH & CO, Mineralogists, 

 Removed to 733 & 735 Broadway, New York. 



PROTECTION FROM LIGHTNING. 



All the capital desired for the parent com- 

 pany to handle my patents on a new method 

 of protecting buildings from lightning has been 

 subscribed. Sub-companies and agencies to 

 introduce the invention are forming, and any 

 desirous of taking State-rights may address me, 

 for the present, as below. 



The English patent is for sale. 



QUERY. 



Can any reader of Science cite 

 a case of lightning, stroke in 

 which the dissipation of a small 

 conductor (one-sixteenth of an 

 inch in diameter, say,) has failed 

 to protect between two horizon- 

 tal planes passing through its 

 upper and lower ends respective- 

 ly? Plenty of cases have been 

 found which show that when the 

 conductor is dissipated the build- 

 ing is not injured to the extent 

 explained (for many of these see 

 volumes of Philosophical Trans- 

 actions at the time when light- 

 ning was attracting the attention 

 of the Royal Society), but not 

 an exception is yet known, al- 

 though this query has been pub- 

 lished far and wide among elec- 

 tricians. 



First inseited June 19. No response 

 to date. 



N. D. C. HODGES, 



47 LAFAYETTE PLACE, 

 NEW YORK. 



N. D. C. HODGES, 47 Lafayette Place, New York. 



AN AMERICAN GEOLOGICAL 

 RAILWAY GUIDE. 



Giving the Geological Formation along the 

 Railroads, with Altitude above Tide-water, 

 Notes on Interesting Places on the Routes, 

 and a Description of each of the Forma- 

 tions. By James MACFAELAifE, Ph.D., 

 and more than Seventy-five Geologists. 

 Second edition, 1890. 426 pages, 8vo. 

 Cloth, $2.50. 



D. APPLETON&CC, Publishers, New York. 



