Archive for the 'J-Jewelry' Category

Jan-6th-2009

Junction Box

In underground distribution systems, an iron casing or box in which the
feeders and mains are joined, and where other junctions are made.
Synonym–Fishing Box.

Jan-6th-2009

Joule’s Equivalent

The mechanical equivalent of heat, which if stated in foot-pounds per
pound-degree F. units, is 772 (772.55). (See Equivalents.)

Jan-6th-2009

Joule Effect

The heating effect of a current passing through a conductor. It varies
with the product of the resistance by the square of the current, or with
(C^2)*R.

Jan-6th-2009

Joule

This term has been applied to several units.
(a) The practical C. G. S. unit of electric energy and work–the
volt-coulomb. It is equal to 1E7 ergs–0.73734 foot pound.–.00134 horse
power seconds. A volt-ampere represents one joule per second.
(b) It has also been used as the name of the gram-degree C. thermal
unit–the small calorie.
Synonym–Joulad.

Jan-6th-2009

Joulad

A name proposed to be substituted for “joule,” q. v. It has not been
adopted.

Jan-6th-2009

Joints in Belts

Belt-joints for electric plants where the belts drive dynamos should be
made with special care. The least inequality affects the electro-motive
force. Butt joints are, generally speaking, the best, where the ends of
the belt are placed in contact and laced. Lap-joints are made by
overlapping the belt, and unless the belt is carefully tapered so as to
preserve uniform [...]

Jan-6th-2009

Joint, Splayed

The method of joining the ends of stranded conductors. The insulating
covering is removed, the wires are opened out, and the center wire,
heart or core of the cable is cut off short. The two ends are brought
together, the opened out wires are interlaced or crotched like the
fingers of the two hands, and the ends are wound [...]

Jan-6th-2009

Joint, Sleeve

A joint in electric conductors, in which the ends of the wires are
inserted into and secured in a metallic sleeve or tube, whose internal
diameter is just sufficient to admit them.

Jan-6th-2009

Joint, Marriage

A joint for stranded conductors used for Galende’s cables. It is made
somewhat like a sailor’s long splice. Each one of the strands is wound
separately into the place whence the opposite strand is unwound and the
ends are cut off so as to abutt. In this way all are smoothly laid in
place and soldering is next applied.

Jan-6th-2009

Joint, Lap

(a) In belting a joint in which the ends are overlapped, and riveted or
otherwise secured in place. If made without reducing the thickness of
the ends it is a bad joint for electrical work, as it prevents even
running of machinery to which it is applied. Hence dynamo belts should
be joined by butt joints, or if by [...]

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