Circular D; Instructions for the Installation and Maintenance of Wind Measuring and Recording Apparatus

Circular D; Instructions for the Installation and Maintenance of Wind Measuring and Recording Apparatus

List price: US$14.14

Currently unavailable

Add to wishlist

AbeBooks may have this title (opens in new window).

Try AbeBooks


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. 1914 edition. Excerpt: ...motion to a cylinder at the rate of one revolution in six hours; the cylinder at the same time is moved endwise on its axis by the steep screw. The surface of the cylinder is covered with a ruled sheet of paper adapted to receive the record, which is traced by means of a pen attached to the armature of an electromagnet. The standard Weather Bureau pen is shown separately in fig. 16. The pen traces a spiral line on the sheet of paper, but by the action of the electromagnet short lateral strokes or offsets are made to one side of the line whenever an electric current is passed through the coils of the magnet. As soon as the circuit is broken the armature and pen are drawn back to the main line by a spring. This action ensues when an anemometer, properly exposed as described in paragraph 27, is joined with the register and a battery by means of insulated copper wires. 83. Under these circumstances the armature and pen on the register will be alternately drawn aside and released every time one of the dial pins on the anemometer passes the contact spring and closes the electric circuit, as explained in paragraph 5. 84. Two-magnet register.--The two-magnet register, shown in fig. 17, is used at those stations where an automatic record of wind direction is not essential. This register records wind velocity in the manner described above for the single register, and simultaneously, on the same record sheet, rainfall and duration of sunshine in the manner described in paragraph 89. 85. Anemograph defined: double register.--The apparatus described in paragraph 82 for recording wind velocity, when complete with anemometer, is sometimes called an anemograph, but this latter word more properly applies to an apparatus which also records the direction of the...
show more

Product details

  • Paperback | 26 pages
  • 189 x 246 x 1mm | 68g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236586093
  • 9781236586094