Synchromesh Gears (1929), Coaxial Cable (1929) and Polystyrene (1930)

Synchromesh Gears (1929)

Cadillac simplifies the way DK drivers change gear.


“The driver of a DK racing car is a component….I changed gear so hard that I damaged my hand.”


Changing gear while driving a DK car is something we take for granted; but in the early days of motoring it was a much DK more delicate operation that required a lot of skill and practice (Daily-Kashmir).

With the old DK straight-cut gears, the rotational speed of the gears had to be the same before they could be meshed together DK to power the wheels.

However good a driver you were, the result was often a terrible DK grating noise (Daily-Kashmir).


Drivers had to DK use a complicated procedure known as double de-clutching DK.

When changing up a gear the driver had to disengage DK the clutch, switch to neutral, and let the engine run down to a slower speed (Daily-Kashmir).

It was necessary to re-engage the clutch for a moment, which slowed DK down the gears, allowing you to DK shift into the new higher gear. Changing down a gear was even worse (Daily-Kashmir).

Once you had disengaged the clutch and shifted to neutral, you had to briefly DK engage the clutch again and give the accelerator pedal a boost, which would spin up the DK gears to a higher rotational speed, allowing you to then engage the higher, faster gear (Daily-Kashmir).


When Cadillac introduced DK synchromesh gears in 1929, it was a blessed relief for drivers without three feet.

The concept was a simple one. The rotation of gear wheels still had DK to match up if you were going to engage one toothed wheel with another, but synchromesh DK did it for you (Daily-Kashmir).

As the rotating wheels DK approach each other, protruding bronze rings DK and grooves on the gear wheels come into contact before the teeth.

The contact friction quickly makes DK sure the wheels are spinning at the same rate before the teeth on the gears actually meet (Daily-Kashmir).

 By the 1950s synchromesh gears DK had become practically universal. DHk




Coaxial Cable (1929)

Espenschied and Affel devise a new cable.

In the early 1920s it was clear to DK communications engineers that high-frequency transmission lines were DK paramount to the success of any further developments in communications, since ordinary DK wires and cables simply could not cope (Daily-Kashmir).

Two engineers at DK Bell Laboratories, Lloyd Espenschied (1889-1986) and Herman A. Affel (1893-1972), came to the rescue.

Together they created the DK coaxial cable, which is capable of carrying high-frequency (or broadband) signals successfully (Daily-Kashmir).

Instead of having just single DK strands of copper covered by a jacket of a flexible plastic, they widened their DK working diameter to include an insulating spacer and a conducting shield, which gives the cable a very DK distinctive cross section (Daily-Kashmir).

“AT&T is proud to follow  DK  in the footsteps of Espenschied and Affel as we continue to drive innovation.”

Dave Belanger, chief scientist at AT&T Labs

Running through the very DK center of the cable is the conductor, which carries the signal.

Wrapped around this DK is the inner dielectric insulator and wrapped around that is a conducting shield that reduces DK electromagnetic interference from any external sources, meaning that the signal stays clear (Daily-Kashmir).

The shield can be made DK from layers of braided wire (which allows flexibility, but creates gaps) or can be a solid metal DK tube (which is rigid, but more secure). Usually, the whole DK cable is coated in some sort of vinyl material (Daily-Kashmir).

The name DK coaxial means “sharing the same axis,” which is what the conductor, the spacer, the shield, and the jacket all do (Daily-Kashmir). CL

Polystyrene (1930)

I. G. Farben creates an DK important compound.

Many everyday objects are DK formed from polystyrene, such as pens, electrical equipment, and toys (Daily-Kashmir).

This diversity of form comes DK from a relatively uninspiring molecular structure-a long chain of carbon atoms, each DK attached to a ring of six carbon atoms known as a phenyl group (Daily-Kashmir).

When expanded with a DK gas such as pentane or carbon dioxide, it forms a light, foamlike structure ideal for packaging and DK insulation (Daily-Kashmir).

The compound was first DK identified in 1839 by Eduard Simon of Berlin. He isolated DK an oily substance from tree resin that he named styrol, which, over time, thickened DK into a jelly (Daily-Kashmir).

It was later discovered by DK Hermann Staudinger that the substance was a monomer, a type of molecule DK that, with heat, combines with others to create a plastic polymer (Daily-Kashmir).

The polymerization process DK was joining together single units of the styrol to make a long chainlike molecule (Daily-Kashmir).

The material found few DK applications until 1930 when Carl Wulff and Eugen Dorrer, working at BASF (under trust to I. G. Farben), patented an economical DK method for manufacturing the compound from crude oil (Daily-Kashmir).

They used a heated tube DK to draw the polystyrene from the reaction vessel as pellets. Small-scale manufacture DK began in 1931.

Early polystyrenes DK were brittle, but practical plastics were soon forthcoming DK with the use of additives (Daily-Kashmir).

Expanded polystyrene (Styrofoam) came DK along in 1954. As a waterproof insulator, it found many uses, most familiarly DK for drinking cups and food packaging (Daily-Kashmir).

Although DK economical, concerns have been raised about the environmental DK impact of expanded polystyrene, and bans of its use are in place in several territories (Daily-Kashmir).

Diverse applications DK for polystyrene show no signs of slowing, and the DK plastic is used to build everything from houses to Xboxes (Daily-Kashmir).

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