CIENCE 
6 SINGLE COPIES, 15 CTs. 
NECA REINS: FRIDAY, SEPTEMBER 1, 1899. iSSSUAG SESE, CA 
WM. GAERTNER & CO. 
Astronomical and Physical Apparatus 
152-158 EAST 56TH ST., CHICAGO 
SPECIALTIES 
STANDARD APPARATUS OF NEW AND IMPROVED DESIGNS 
READING MICROSCOPES AND TELESCOPES 
ASTRONOMICAL TELESCOPES HELIOSTATS 
3%-inch Telescope SPECTROSCOPES DIVIDING ENGINES, COMPARATORS 
on Universal Mounting MICHELSON INTERFEROMETERS GENERAL LABORATORY APPARATUS 
Price, $150.00 BOLOMETERS UNIVERSAL LABORATORY SUPPORTS 
MINIATURE INCANDESCENT LAMPS. 
MINIATURE LAMP RECEPTACLES. 
X-RAY TUBES AND APPARATUS. 
FLUOROSCOPES. 
Catalogues on Application. 
Bdison Decorative and Miniature Lamp Department, 
(GENERAL ELECTRIC ComPANy,) 
HARRISON, W. J. 
We now offer complete meteorites of the three varieties at following prices: 
e 
Meteorites SIDERITES (iron meteorites), 10c. to $3—sections etched to show struc- 
ture, 75c. to $4. SIDEROLITES (partly iron and stone), 35c. to $3.50— 
polished sections, 75c. to $5. AEROLITES (stone meteorites), 35c. to $2.75. If you have or know of a 
new fall or find of any meteorite, whatever its variety, advise us as we desire to obtain all known falls and finds. 
WARD'S NATURAL SCIENCE ESTABLISHMENT, 28 to 40 College Ave., Rochester, N.Y. 
* By Recent Appointment 
the undersigned now acts as Sole Agent in the United States and Canada for all appa- 
ratus made by the Société Genevoise. 
Se 
aSss: 
As is well known to most American physicists, this company manufactures a superior 
grade of Physical Laboratory Apparatus, including Dividing Engines, Standards of 
Length, Micrometers, Cathetometers, Comparators, Spectroscopes, Spectrometers, Micro- 
scopes, Astronomical Telescopes, Heliostats, Chronographs, etc. 
“Duty Free’’ College Prices and JAMES G. BIDDLE 
other particulars will be furnished 
upon request. 1034 Drexel Building, Philadelphia, Pa. 
