The _Resistance_ of Copper varies with the temperature about 0.38 per
cent. per degree Centigrade, or 0.21 per cent. per degree Fahrenheit.

STRANDED WIRES.--With a conductor of a definite lenght, made of
_Stranded_ Wires, the total _weight_ is _greater_, and the _Resistance
less_ than is a similar length of Conductor with Wires _not_ Stranded.

To convert--Inches to Millimetres multiply by 25.3994
Feet to Metres " .3048
Yards to Metres " .9144
Miles to Kilometres " .6214
Pounds to Kilogrammes " .45359

PEPARED BY WALTER T. GLOVER & CO., ELECTRICAL WIRE AND CABLE MAKERS, 25,
BOOTH STREET MANCHESTER.

* * * * *




IRON FRAME GANG MILLS.


The gang mill is regarded as possessing material advantages in the rapid
and economical manufacture of lumber. Among the recent improvements
tending to perfect such mills, those which are shown in the iron frame
stock gang, manufactured by Wickes Bros., East Saginaw, Mich., are
eminently valuable. Our large engraving represents one of these mills,