WW1 AIR SPEED INDICATOR BRISTOL CO. AIR SERVICE U.S. ARMY TYPE C RARE For Sale

WW1 AIRSPEED INDICATOR BRISTOL CO. AIR SERVICE U.S. ARMY TYPE C RARE
VINTAGE ORIGINAL
AIR SPEED INDICATOR
This is a very rare instrument! AIR SERVICE U.S. ARMY TYPE C
this is predating Pioneer.
Indicates from 0-160 M.P.H.
4 ¼” Face with a 4 bolt 5” mounting flange
Two nickel prongs protruding from bottom, possibly for attachment.MARKED The Bristol Co./ Waterbury, Conn.
William H. Bristol was born in Naugatuck in 1859.
William Bristol is credited with more than 100 patents, including a filled system temperature recorder in 1888,
a recording voltmeter in 1893, an electric pyrometer in 1900,
a thermocouple using a combination of nickel and a tungsten-iron alloy in 1904,
a hygrometer in 1910, an air speed indicator in 1911PLEASE CONTACT ME IF YOU BELIEVE I HAVE DESCRIBED THIS INCORRECTLY,
(I'M NOT A COLLECTOR OF WW1 MATERIAL)
I WILL REVISE THE LISTING IF YOU HAVE OTHER INFORMATION ON THIS
THANKS!FEEL FREE TO ASK QUESTIONS, I'LL DO MY BEST IN ANSWERING THEM!
I SHIP WITH-IN ONE BUSINESS DAY AND WITH TRACKING
I COMBINE SHIPPING, ANY ADDITIONAL PHOTOS WILL SHIP FOR FREE, PLEASE WAIT FOR AN INVOICE