OCR Text |
Show '! 'H Aeroplane Propellers. jH Soloctcd ash, which 1b both atronf. ' H and light and will not split undor. .,, 'H vibration or shock, or built-up lay ' - .H ors of spmco with mahogany centers, 'H aro tho mnterlnls with which tho pre- ' H pollers of aeroplanes such as aro bo- H lng used In tho European war aro con- i Btructcd, Tho framework of tho ma- 'M chinos, too, Is generally mado of wood, I MU Bpruco bolng much used on account of , l Its straight grain and freedom from hidden defects. M |