EXHIBIT 24 POWERS OF ATTORNEY Each person whose signature appears below hereby authorizes Richard W. Parod, as attorney-in-fact, to sign on his behalf, individually and in each capacity stated below, the Registration Statement on Form S-8 for the Lindsay Manufacturing Co. 2006 Long-Term Incentive Plan and any post-effective amendments thereto, and to file the same, with all exhibits thereto, and all documents in connection therewith, with the Securities and Exchange Commission.

SIGNATURE TITLE DATE --------- ----- ---- /s/ Richard W. Parod Director, President and Chief February 6, 2006 - ---------------------------------- Executive Officer Richard W. Parod /s/ David B. Downing Chief Financial Officer, Treasurer, February 6, 2006 - ---------------------------------- Secretary, Vice President-Finance David B. Downing /s/ Howard G. Buffett Director February 6, 2006 - ---------------------------------- Howard G. Buffett /s/ Michael N. Christodolou Director and Chairman of the Board February 6, 2006 - ---------------------------------- Michael N. Christodolou /s/ Larry H. Cunningham Director February 6, 2006 - ---------------------------------- Larry H. Cunningham /s/ William F. Welsh II Director February 6, 2006 - ---------------------------------- William F. Welsh II /s/ J. David McIntosh Director February 6, 2006 - ---------------------------------- J. David McIntosh /s/ Michael C. Nahl Director February 6, 2006 - ---------------------------------- Michael C. Nahl