Henry Cavendish, London 1731 - 1810
1766 - Henry Cavendish, was a British scientist noted for his discovery of hydrogen or what he called "inflammable air".[1] He described the density of inflammable air, which formed water on combustion, in a 1766 paper "On Factitious Airs". Antoine Lavoisier later reproduced Cavendish's experiment and gave the element its name (hydrogen).
Martinus van Marum, Delft, Groningen, Harlem, 1750 - 1837
1776 - Dutch scientist Martinus van Marum did various experiments with electricity. During one of his experiments (Groningen) he created Oxygen and Hydrogen gas using electrolises. He discovered (by accident?) that this mixture can be ignited (exploded) by an electric spark.
1781 - Antoine-Laurent de Lavoisier, Paris, 1743-1794, was a French nobleman prominent in the histories of chemistry, finance, biology, and economics. He stated the first version of the law of conservation of mass,[2] recognized and named oxygen (1778) and hydrogen (1783)
1781 - The famous French scientist Lavoisier wrote;
" Léau est le grand réservoir, où la Nature trouve la masse de combustibles, qu'elle forme continuellement sous no yeux, et la vegetation paroît être son grand moyen " (M.1781. p. 491).
Which says; " Water is the large tank, where Nature finds the fuel mass, what continuously forms under our eyes, and the vegetation cell to be its great means".
1789 - Dutch chemists Paets van Troostwijk and Joan Rudolph Deiman (Amsterdam) proved with their experiments for the first time, that water his elements are exactly 1 part oxygen and 2 parts hydrogen They used electricity to split water in his elements and used a spark to to combine the elements again in water. In the same experiment they were able to measure the exact volume of the elements.
1803 - Robert Hare developed and experimented with the oxy-hydrogen blowpipe
1826 - Thomas Drummond discovered that an intense illumination is created when an oxyhydrogen flame is directed at a cylinder of calcium oxide, which can be raised to white heat without melting. He built the so called "Drummond Light" also calles "Limelight". This "Drummond Light'' 'can be created with oxyhydrogen gas and calcium oxide.
1860 - Mr. Jean Joseph Etienne Lenoir from Belgium/ France built the first car that produced its own combustible hydrogen fuel by onboard electrolysis (powered by a battery).
First Water powered car (1860)
1875 - Jules Verne in his book The Mysterious Island, wrote the following age: 
"Water decomposed into its primitive elements, and decomposed doubtless by electricity, which will then have become a powerful and manageable force. Yes, my friends, I believe that water will one day be employed as a fuel".
A 
B 
late 1800's
1888 - Al lot of research concerning HHO (called Hydroxygeen Gas) applications and HHO production was being done in the late 1800's. For example A: Adding carbon vapour to the HHO flame for getting a better flame for lightning and heating. B: Safely burning Hydrogen mixed with Oxygen gas by using a Bunsenburner and the use of a metal grill for flashback protection. They already new very well how to use the gas at that time. But it wasn't economical because of the high price, and limited availability, of electricity making HHO gas. Todays HHO generators are far more efficient!
1918 - Mr. Charles H. Frazer patented the first "Hydrogen Booster" system for internal combustion engines. USA Patent.No. 1,262,034 He stated that his invention: 1 - increases the efficiency of internat combustion engines. 2 - Complete combustion of hydrocarbons. 3 - Engine will stay cleaner. 4 - Lower grade of fuel can be used with equal performance.
Henry Garrett, Dallas USA
1935 - Inventor Henry Garrett patented a electrolytic carburator and let a car run just on tap water.
1943 - 1945 - Because of serious conventional fuel shortage at the end of WW2, the British army used Oxyhydrogen gas generators in their tanks, boats and other vehicles to get better mileage and to to prevent engine overheating for vehicles used in africa. They used generators just alike some of the today's HHO fuel savers. Right after the WW2 the government ordered to remove and destroy all generators from the vehicles.
Dentaurum Hydro-Lötgerät 
.....But at least a few generators survived. In the mid 1970's a German company named Lötgerat produced Oxyhydrogen generators. They used all new materials and parts except..........for the generator unit and the bubbler. They are obviously much older and made roughly of solid steel. Made in the same way as all of the other army equipment. Built to last. That is why the unit in the picture is still in working order.
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Mr. Denny Klein of 
140 pages, Ring bound 