The set is mounted to wood and one of the gauges is marked wilfred o. White & sons wind velocity and the other is marked airguide barometer. I believe these would have been originally attached to a wind gauge outside or something. Nice set and in great condition. Dials measure about 4½ wide. Sorry, it’s mandatory! The free listing tool.The item “Vintage Wind Velocity Airguide Barometer Gauge Set Wilfred O. White Wall Mounted” is in sale since Monday, April 20, 2015. This item is in the category “Collectibles\Science & Medicine (1930-Now)\Scientific Instruments\Barometers”. The seller is “bleeding_gums” and is located in Lannon, Wisconsin. This item can be shipped worldwide.