Two New Inventions Among the plant exhibits he inspected were two highly important inventions given public announcement for the first time: a machine successfully transmitting sound by means of light and a boiler utilizing mercury, as well as water, in the generating of steam for the driving of turbine engines. The first, officially called the “pallo-photophone” but immediately christened by newspaper correspondents as the “talking movie" — for that, with the voice recorded on ordinary motion picture film and synchronized precisely with the action, is exactly what it is — has possibilities of revolutionizing radio broadcasting, wireless photography, and a number of similar related fields. The principle of the mercury boiler is the utilization of mercury between the fire and the under-boiler surface exposed to the flame — the mercury, when vaporized, going into a mercury turbine and then into a condenser, remaining hot enough to generate steam in a steam boiler. Roughly, it is a case of getting double the boiler and turbine power at less expense for fuel than for operating only one steam boiler. This invention may work radical changes in turbine power transmission.

How does the use of the word pallo-photophone in Paragraph 2 affect this passage?

It implies that there was an early version of telephone technology.

It helps readers understand the technology behind photography.

It implies that the passage is intended for people with an interest in electricity.

It helps readers understand the science behind motion pictures with sound.