New SERIES. SINGLE COPIES, 15 CTS. 
VoL. X. No. 250. FRIDAY, OcTOBER 15, 1899. ANNUAL SUBSCRIPTION, $5.00 
JUST PUBLISHED 
_ NEW PAMPHLET, 44 pages 
on CABLE. TESTING APPARATUS - 
giving full description of various outfits for Cable Testing and Instructions 
for Making Various Tests and [leasurements. 
NEW PASIPHLET, 40 pages 
THE QUEEN ACME TESTING SET 
giving description of the Queen Acme Set and entering fully into Wheat- 
stone’s Bridge Methods. 
NEW PAMPHLET 
on PHOTOMETERS 
describing the latest forms of the Queen Photometers, both stationary and 
portable, and containing instructions for Photometric work. 
ANY OF THESE PUBLICATIONS SENT FREE BY MAIL ON REQUEST. 
QUEEN & CO., INc. 
J. G. GRAY, President 
Electrical and Scientific Instrument Works 
Pr Ea arenas 1010 Chestnut St., Philadelphia 
