Treatise on Meteorological Apparatus and Methods (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888 Excerpt: ...that the vane rod can not be passed through the roof to the ceiling a cast-iron base BB, (Fig. 44), is used. This is set up as follows: A suitable wooden block is to be firmly fastened to the roof upon which the cast-iron base will be securely attached. The lower end of the pipe P, through which the vane rod passes, will be placed in the socket at the top of the cast-iron base, and the vane rod itself, DD, passed through the two apertures in the top and bottom of the base BB and through the wooden block underneath the base. A hole should be bored in the wooden block of greater diameter than the vane rod in order to prevent friction. In erecting the vane care must be taken to place it at such an elevation that the vane rod will not extend too far below the iron base. After the large pipe P supporting the vane is firmly braced to the roof, and before the vane is attached to the rod, the contact friction rollers 0 must be placed in position. This will be done by raising the vane rod sufficiently to enable the circuit closer coco and friction rollers G to be slipped on the lower end of the rod. Lower the rod to its former position, so that the upper friction rollers (which.are immediately below the vane) will rest upon the cap of the pipe. Then fasten the lower friction rollers, G, to the vane rod DD, so that the weight of the rod will be as equally distributed as possible between the upper and lower friction rollers; place the circuit closer pcccc and plate AA in position. (0) Dechcvrenis anemograph.--A vane with both vertical and horizontal balanced plane plates is mounted on a horizontal axis, supported by a copper stirrup soldered to the extremity of a tubular shaft, which descends into the observatory. At the lower end of this shaft is a zinc cylinder floa...