Hide Articles List

11 articles on this Page

......... t -' -...1.:C' .-…

I QUAINT SUNDAYS. I

IDANGER OF DULL DAYS.I

ITHE SMALLEST MOTOR.I

News
Cite
Share

I THE SMALLEST MOTOR. I A jeweller e of Hillsboro, North Dalcti, has constructed a motor, Raid to be the smallest in the world. The motor, just a fraction over a quarter of an inch long, is perfect in every way, and contains every- thing found in larger motors. The com- mutator has four segments made of gold, each segment being insulated from the other with mica. Fibre is used as insulation be- tween commutator and shaft; also between the e-ad pieces and commutator. The com- mutator is built up in the same way as the ones on the larger machines, no glue or cement being used in its construction. The commutator is 0.045 inch in diameter, and is mounted on pivot steel shaft 0.009 inch in diameter. The armature has four poles and is wound with No. 40 silk covered wire. Its diameter is 0.0!) inch. The brushes are made of silver and are 0.12 inches in dia- meter. The springs for the brushes are 0.004 inches in diameter. The motor has two field coils between the armature and yolk. The length of the entire motor is ID-Gdin. and its height ll-G4in. It weighs â¢H grains. A small flashlight battery fcup- plies the current.

IWHERE GOATS COME FROM.I

[No title]

Advertising

I CLUB WINDOW. iU 1.) 'i K…

I--_-! IAT A GREAT RATE.

" * 1-r " «B t I THINGS THOUGHTFUL.

[No title]