In the years he was in California he experimented incessantly with machinery.
He gave to the public various inventions of practical value.
Besides being a practical inventor he was also a manufacturer of his special machinery.
In 1891 he was experimenting on what was considered a most important invention.

1868 - IMPROVED CARRIAGE-SPRING.

1872 - IMPROVEMENT IN STEAM-BOILER FURNACES.

1872 - IMPROVEMENT IN BALING-PRESSES.

1873 - IMPROVEMENT IN DIVIDED-NUT DEVICES FOR FEED-SCREWS.

1874 - IMPROVEMENT IN SHINGLE-MACHINES.

1874 - IMPROVEMENT IN MAGAZINE FIRE-ARMS.

1878 - IMPROVEMENT IN ORE-STAMPS.

1880 - FEED AND SET WORKS FOR SAW-MILLS 
1889 - VEHICLE.

1891 - POWER STREET-PAVING MACHINE.

His mining experience gave him the idea for a roller quartz mill, improved ore crushers, concentrators and many other needed mining equipment improvements of older mining machinery.
It is inventions like his that made San Francisco the center of the manufacture of mining machinery for the United States.

1880 - ORE CRUSHER AND PULVERIZER.

1880 - AMALGAMATOR.

1881 - ORE-FEEDER FOR CRUSHING-MILLS.

1881 - GRINDING AND AMALGAMATING PAN.

1882 - CRUSHING MILL.

1885 - ROCK CRUSHER OR BREAKER.

1885 - CRUSHING MILL.

1887 - ORE-CRUSHER.

1888 - ORE-FEEDER.

1890 - CRUSHING-MILL.

1890 - CRUSHING-MILL.

1891 - ORE-FEEDER FOR CRUSHING-MILLS.

1892 - ORE-CAR.

1896 - CRUSHING-MILL.

1898 - ROLLER CRUSHING-MILL.

1908 - CRUSHING-MILL.
In the years he was in California he experimented incessantly with machinery. He gave to the public various inventions of practical value. Besides being a practical inventor he was also a manufacturer of his special machinery. In 1891 he was experimenting on what was considered a most important invention. 
1868 - IMPROVED CARRIAGE-SPRING.
1872 - IMPROVEMENT IN STEAM-BOILER FURNACES.
1872 - IMPROVEMENT IN BALING-PRESSES.
1873 - IMPROVEMENT IN DIVIDED-NUT DEVICES FOR FEED-SCREWS.
1874 - IMPROVEMENT IN SHINGLE-MACHINES.
1874 - IMPROVEMENT IN MAGAZINE FIRE-ARMS.
1878 - IMPROVEMENT IN ORE-STAMPS.
1880 - FEED AND SET WORKS FOR SAW-MILLS 
1889 - VEHICLE.
1891 - POWER STREET-PAVING MACHINE.
His mining experience gave him the idea for a roller quartz mill, improved ore crushers, concentrators and many other needed mining equipment improvements of older mining machinery. It is inventions like his that made San Francisco the center of the manufacture of mining machinery for the United States.
1880 - ORE CRUSHER AND PULVERIZER.
1880 - AMALGAMATOR.
1881 - ORE-FEEDER FOR CRUSHING-MILLS.
1881 - GRINDING AND AMALGAMATING PAN.
1882 - CRUSHING MILL.
1885 - ROCK CRUSHER OR BREAKER.
1885 - CRUSHING MILL.
1887 - ORE-CRUSHER.
1888 - ORE-FEEDER.
1890 - CRUSHING-MILL.
1890 - CRUSHING-MILL.
1891 - ORE-FEEDER FOR CRUSHING-MILLS.
1892 - ORE-CAR.
1896 - CRUSHING-MILL.
1898 - ROLLER CRUSHING-MILL.
1908 - CRUSHING-MILL.
Frank Atwood Huntington