Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 233
Fig. 186 222 PKACTICAL APPLIED ELECTEICITY called ventilating ducts, can be made by placing a piece ofmetal on edge, as shown in Figs. 187 and 188, and fasteningthem to the disk. These ventilating ducts are usually spacedfrom 2 to 4 inches apart.
Electrical engineering
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