Teobaldo Julio Ricaldoni Saroldi, Uruguayan-born Argentine engineer, physicist and inventor (Montevideo 24 May 1861 or 1865 – La Plata, Buenos Aires Province 22 September 1923)
From Italian parentage
Brother of Americo Ricaldoni
ACHIEVEMENTS IN ASTRONOMY
Performed discoveries on Neptune and Pluto
Predicted a Mercury moon in magmatic state
INVENTIONS
Wireless telegraph (1899) and its receiver
A new system of wireless radial transmission
Panoramoscope, a new periscope system (1908)
A new design of parachute
Propelling system for navigation without wings or propellers
Ornitoptero, a new design of helicopter
A torpedoes deviation system
Brush fire, a novel weapon design
“Electric Cannon”
Life buoy named El Salvator
A novel submarine design that included other 27 additional inventions (1892)
Ricaldoni switch (1899) and the transmitter, 2 communication devices
A voltage reducing device (Ricaldoni reducer)
Contact wheel between the cables and the trolley
A vibrator
A magnetic Cannon
Numbered marks
Motion trains communication
Intellect Meter
Can opener
Hydraulic lift
Oxygen bag and packaging
Improvements in electric vibrators for telephone and telegraphy (1900)