Back around 1931, Marcellus Jacobs (see the Plowboy Interview in MOTHER EARTH NEWS NO. 24) designed a wind-driven generator of electricity. It was good. So good that now — over 40 years later — every commercially successful windplant currently being manufactured anywhere in the world is still more or less a Chinese copy of Jacobs' unit.
Over the decades, of course, many other inventors have tried to improve — or replace — the Jacobs windplant with modifications of the basic unit or completely new designs of their own. Not a single one seems to have had much luck in that endeavor ... so far but that hasn't discouraged a steady stream of new experimenters from trying to beat Marcellus at his own game year after year after year.
Now that a goodly percentage of the earth's human population is finally beginning to realize the finite nature of the planet's fossil fuel reserves and is interested in learning more about wind power, the search for more efficient windplant designs has suddenly grown even more intense ... and a sampling of the latest work in the field is shown on the pages that follow.
We have a service to offer anyone building a windplant: complete design of the blades (with templates) plus generator, transmission, and tower strength considerations. Just provide the following information:
 Average power needed, in watts
 Average wind at site, in mph
 Average temperature at site, in degrees F
 Altitude of site, in feet
 Type of transmission
[a] direct drive
[c] timing belt
[d] V belt
 Number of shafts in transmission
 Generator efficiency, if known (if not, just give nameplate data)
The cost of the full service is $5.00, and we'll also rent you a wind velocity meter for $1.00 plus $5.00 returnable deposit.
There's a lot going on in the field of wind power these days ... and folks who are trying to keep abreast of current developments might want to check out a new publication, Wind Power Digest, edited by Mike Evans of Bristol, Indiana. Mike describes the first issue now available as "really an access catalog to wind power systems, designed to convey as much general information as possible ... and hopefully to encourage a reader response cycle to keep the magazine going." Whether or not that happens, Wind Power Digest No.1 may turn out to be something of a collector's item if it lives up to its table of contents:
 Photographs, drawings, and informational reviews of all available electric-generating and water-pumping windmills, including Aerowatt, Dunllte, Electro, Winco, Lubing, Jacobs, Dempster, Baker, and Aermotor. Also listed are four windplant designs now being researched for possible marketing: American Wind Turbine, Zephyr Wind Dynamo, Sailwing, and Helion 12/16.
 A Plans section including reviews of the Sencenbaugh 02 Powered Delight, Windworks, Sailwing, and 1 Footer, Earthmind's S-Rotor, Brace Research S-Rotor, and a number of other miscellaneous plans.
 A look at Jim Sencenbaugh's new windplant kit.
 Listings of various wind systems components, including batteries. inverters. miscellaneous, electronics, towers, back-up generators, and windspeed measurement equipment.
 Listings of 18 companies which now market various wind power systems and components.
 Reviews of the 14 most valuable publications currently available in the wind power field.
 Reports on the groups researching wind power, including a complete rundown on the activities of Brace Research Institute during the past 14 years.
 Several features, including Bill Goddard's "An Introduction to Helion", an interview with Environmental Energies of Detroit, and an article by Winnie Red Rocker.
That's a lot of useful material right there and Mike is prepared to leave it at that if he must. He'd much prefer to publish regularly, however, and is all set to do so if No. 1 is well received. Which means, alternative energy freaks, that the future of Wind Power Digest is up to you.
You may also use the Bill Me option and pay $17.95 for 6 issues.