Up Miscellaneous Mining Items Prev Next Slideshow

 Previous image  Next image  Index page  Original Image [3 in Davis Anemometer Back.JPG - 771kB]
Cupel Mould
Cupel Mould II
Cupel Mould Ad 1899 John Taylor & Co Catalogue
3 and 4 in Davis Anemometers
3 in Davis Anemometer Front
  3 in Davis Anemometer Back.JPG - 3 IN. DAVIS ANEMOMETER - Mining anemometer, 3 1/4 in. dia. to outer edge of frame with 1 5/8 in. dia. glass-covered dial with tens, and two smaller dials for hundreds and thousands counters, marked DAVIS INSTRUMENT MFG. CO. BALTIMORE MD, with counter on/off lever and counter reset thumbwheel, frame is all brass and includes 8 aluminum vanes (The anemometer was invented and named by Benjamin Biram in 1844.  Biram was house steward to the Earl Fitzwilliam of Wentworth Woodhouse who owned a number of collieries in South Yorkshire, England.  John Davis & Son Ltd. of Derby manufactured the first Biram anemometer in 1845.  The anemometer is an instrument designed to measure the flow or speed of air and was used in the ventilation of mine shafts.  As shown, a vaned propeller is attached to a dial that records the number of turns that it makes over a period of time and converts this reading into a measurement of air speed.  In deep coal mines, the gases given off by the coal can accumulate in the mine passages and become concentrated. When this happens, the slightest spark can set off an explosion. To prevent this happening, big fans are used at the pit top to draw fresh air around the mine and take the gas away to the surface. Anemometers were used by the Mine Deputies every day to check that there was a sufficient flow of fresh air throughout the whole mine.  This anemometer was manufacturered by the Davis Instrument Mfg. Co. of Baltimore.  A discussion of the John Davis & Son Ltd. company of Derby, England is included with a Davis safety lamp in my safety lamp section.  The Davis Instrument Mfg. Co. was started by Herbert Davis, one of seven sons of John Davis, in 1912.  Herbert had been contracted by the John Davis & Son Ltd. to establish a branch office in the US to sell Davis Derby products.  The venture proved to be extremely successful with Herbert and later his son Alfred managing the company into the late 1960s until Alfred's death.  The company was sold to new owners and continues in business today.  Early anemometers are highly prized by both mining artifact and scientific instrument collectors.  See David J. Hind, Davis Derby-A History of Engineering, Mining History: The Bulletin of the Peak Mines Historical Society, Vol. 14, No. 2, Winter 1999)  
4 in Davis Anemometer
Du Pont Tamping Bag
Dupont Letter Openers Front
Dupont Letter Openers Reverse
Instructions pages 12&13

3 in Davis Anemometer Back | 3 IN. DAVIS ANEMOMETER - Mining anemometer, 3 1/4 in. dia. to outer edge of frame with 1 5/8 in. dia. glass-covered dial with tens, and two smaller dials for hundreds and thousands counters, marked DAVIS INSTRUMENT MFG. CO. BALTIMORE MD, with counter on/off lever and counter reset thumbwheel, frame is all brass and includes 8 aluminum vanes (The anemometer was invented and named by Benjamin Biram in 1844. Biram was house steward to the Earl Fitzwilliam of Wentworth Woodhouse who owned a number of collieries in South Yorkshire, England. John Davis & Son Ltd. of Derby manufactured the first Biram anemometer in 1845. The anemometer is an instrument designed to measure the flow or speed of air and was used in the ventilation of mine shafts. As shown, a vaned propeller is attached to a dial that records the number of turns that it makes over a period of time and converts this reading into a measurement of air speed. In deep coal mines, the gases given off by the coal can accumulate in the mine passages and become concentrated. When this happens, the slightest spark can set off an explosion. To prevent this happening, big fans are used at the pit top to draw fresh air around the mine and take the gas away to the surface. Anemometers were used by the Mine Deputies every day to check that there was a sufficient flow of fresh air throughout the whole mine. This anemometer was manufacturered by the Davis Instrument Mfg. Co. of Baltimore. A discussion of the John Davis & Son Ltd. company of Derby, England is included with a Davis safety lamp in my safety lamp section. The Davis Instrument Mfg. Co. was started by Herbert Davis, one of seven sons of John Davis, in 1912. Herbert had been contracted by the John Davis & Son Ltd. to establish a branch office in the US to sell Davis Derby products. The venture proved to be extremely successful with Herbert and later his son Alfred managing the company into the late 1960s until Alfred's death. The company was sold to new owners and continues in business today. Early anemometers are highly prized by both mining artifact and scientific instrument collectors. See David J. Hind, Davis Derby-A History of Engineering, Mining History: The Bulletin of the Peak Mines Historical Society, Vol. 14, No. 2, Winter 1999) Download Original Image
Total images: 226 | Last update: 10/31/17 4:34 PM | Help