Handy man's workshop and laboratory . Fig. 171—A home-made airthermometer I9: HANDY MAN S WORKSHOP AND LABORATORY HOW TO MAKE AN ELECTRICAL ANEMOMETER The velocity of the wind is usually measured by noting therate of rotation of a small wheel driven by the wind. In theinstrument described below, the pressure of the wind is used as <?-s. Fig 172—Details of the electrical anemometer a measure of its velocity. A thin board is backed by a spring,which is held into the wind by a vane. The compression of thespring is determined by means of a weighted cord attached to HANDY MAN S WORKSHOP AND LABO
Handy man's workshop and laboratory . Fig. 171—A home-made airthermometer I9: HANDY MAN S WORKSHOP AND LABORATORY HOW TO MAKE AN ELECTRICAL ANEMOMETER The velocity of the wind is usually measured by noting therate of rotation of a small wheel driven by the wind. In theinstrument described below, the pressure of the wind is used as <?-s. Fig 172—Details of the electrical anemometer a measure of its velocity. A thin board is backed by a spring,which is held into the wind by a vane. The compression of thespring is determined by means of a weighted cord attached to HANDY MAN S WORKSHOP AND LABORATORY I93 the board and which passes through a tube to a convenient loca-tion within the building. In Fig. 172 the board against whichthe wind presses is indicated at A. It must be 1 foot square, andis preferably made of Y\-inch stuff and secured to a brass tube B30 inches long by means of two nuts, one at each side of theboard. The vane C is cut from a board 30 inches long by 6inches wide and ^J of an inch thick. A piece of strap iron, D, isfastened to one end of the board, and projects above it. A holeis drilled through the strap iron to receive the tube B, which ridesover a roller, E, and under a second roller, F, fastened on theupper edge of the vane. Between the board A and the strapiron is a brass spring of No. 15 wire abo
Size: 1466px × 1705px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1900, bookdecade1910, booksubjectworkshoprecipes
