an electric car that receives energy through a collector mast from city generators. Gyroscope This is used to fly to other planets. Rocket propulsion is not mentioned at all. The rotation of a gyroscope can be used to counter vertical gravity. Helio-Dynamophores Basically solar panels. To minimize atmospheric interference, Meteoro-Towers are used. Hypnobioscope A sleep learning device. Information is recorded on black film as a white wavy line that is transmitted to the sleeper via wires into a headband with metal plates. Language Rectifier A real-time translator built into the (see below). Luminor An automated lighting system that responds to voice commands to activate and change the intensity of illumination. This is an example of fluorescent lighting or cold light, but the term fluorescent lighting is not used in the story. Menograph A device that can record a person's thoughts in writing using a type of mind-script. Money The value of money is based on the faith and credit of the government. It can be dispensed like a roll tape. Denominations can be torn off the tape. No mention of electronic money is made. Meteoro-Towers Weather control stations. Newspaper A postage stamp-sized newspaper consisting of 8 pages. It can only be read by inserting it into a projector or portable viewer to see the very tiny print. Each page can be revealed by exposing it to a different color of light, which will also hide the other 7 pages from sight. It is updated every 30 minutes. No mention of electronic news or an internet is made. Packet-Post Conveyor Underground postal delivery system using conveyor belts. Permagatol A green gas that preserves organic matter indefinitely without any deterioration whatsoever. Phonolphabet Machine A voice recorder that records speech graphically using a phonolphabet language. One can either read the recording or play it back as an audio recording. Platinum-Barium-Arturium Eyeglasses Basically X-ray specs that really work, except they can only detect radium-infused elements through solid matter. Pulsating Polarized Ether Wave Basically a type of radar device before the word "radar" was coined. Radioperforer A handheld weapon that shoots Radium beams that can stun or kill. Signalizers A searchlight guidance system for flying machines consisting of multiple colors and blinking patterns Space Flyer An interplanetary flying machine using gyroscopes. Subatlantic Tube An underground train that uses magnetism to move 300 mph. The path of the tube is through the Earth to make a