Chemistry and Physics. 59 
SOIEN TIF IO INTELLIGENCE: 
I. CHEMISTRY AND PuysIcs. 
1, Viscosity of gases.—The leading article in the Annalen der 
Physik und Chemie, No, 11, 1884, is upon the saaty of Max- 
well’s formula for vise osity. The author, Hr. Otto Schumann, 
sums up the results of his late investigation as fo ilo WSs: 
(1) Maxwell’s formula gives under certain conditions, and at 
higher temperatures, discrepancies which cannot be accounted for: 
by ‘a of observation, 
2) By means of a coefficient of correction Maxwell’s formula 
ean be made to give at o oRPary PSORRESADE es results which agree 
well with the transpiration me 
(3) The transpiration “a gives, on account of absorption, 
too large values for the viscosity of gases at higher temperatures. 
e results for steam are too sma 
4) The flapendente of the viscosity upon the temperature in-- 
- Creases with the 
e coétficlents of yingesisy of all vapors investigated by 
the author have e approximately the same temperature function. 
6) Puluj’s relation between Se lenatue and index of refrac- 
tion increases for the vapor s of homolo ogous ethers with the 
2. Distt ution at, electric lighting over great distance: —At 
the late International Electrical Exposition in Turin a pink ne: 
ag upon this subject. M. Tresca gives the results reached 
mia committee in a communication to the French Academy.. 
_ Gaulard and Gibbs established between the station of 
nd intermediate stations a circuit, of which the pie 
: cakes rs 
length, including the return circuit, was eae 
as a chrome bronze 3°7 millimeters in diameter and un- 
Covered. The current was an alternating one, produced by a 
Siemen’s dynam 3 se-power ty t t was 
arranged so that the electrical energy could be utilized simulta- 
SeOuUR fferent me of lighting in the exposition 
e 
apiaty Sera oF been ae CoMeTUCHOM, which have been 
the w the 25 appar 
1 1) At the Sr oiinice building 9 Bernstein lamps, 1 Soleil 
amp, 1 Siemen’s lamp, 9 Swan lamps and 5 other Bernstein 
ee ay a short distance. All of these lamps required different 
enti ) 
13) At the station of Turin-Lanzo, distant 10 kilometers, 34 
Edison Jamps of 16 candle power; 48 of 8 candle power, and one 
Siemen’s are light. 
