New voltaic battery

313

New Voltaic Battery.

May, 1879.]

ever, it is easy to see that their figure is too small to embarrass the practical mechanic, who in all cases should not hesitate to give an exceas to the width above.that which proceeds i¥om the c~lculations here given. i

i

o

o

°

Fraction Ratio of Friction of the to the Circumference. [ Pressure.

Fraction IRatm of Frlctmn • of the [ to the Circumference. i Pressure.

30

]~-

0-0660

22.~

~g

0"0491

60

~

0-1363

45

~

0-1005

~

0"1545

1

90

a

0 2112

67~

120

T4~

0"2911

112~

]~g

0"2706

150

T~

0"3763

135

~g

0"3330

0-4670

157.~

-176

0"3933

0"5674

202~

~-

0-5390

240

0"6669

225

~

0"6145

270

0"7769

247~,

~

0"6937

0"8941

292~

~

0-8642

1"0190

315

1"1522

337~

H ~

0.9551 1"0515

180 210

300

: 30 ;)60

7

}} ~-~

N e w V o l t a i c B a t t e r y . - - M . A. Heraud uses chlorohydrate of ammonia and calomel. When the circuit is closed the chlorohydram of ammonia, in the presence of zinc, tbrms a chloride of zinc with the ~ransference of ammonia and hydrogen to the positive electrode. The hydrogen reduces the calomel, yielding metallic mercury, chlorohydri(: acid, and consequently chlorohydratc of ammonia. As long as there remains ally of the calomel about the positive electrode the chlorohydrate of ammonia will be regenerated. In a battery of nine elements the intensity was "73 at tile end of 227 days, and "50 at the end of 984 days, the primitive intensity being 1. When compared to sulphate of (~)pper the mercury gave an intensity of 1"4512 at the beginning, and 1'0749 after six months' use.--Comptes Rendu.~. C.