blank space only as many letters as are required need be brought into view. The device is used in arranging letters to spell short words after which the words are to be copied on a slate to fix them in the memory. This invention has been patented by Mr. Albert M. SPENCER'S IMPROVED HAY RAKE. A FROST PROOF TRAP FOR CAR HEATING., scientific american, 1887-06-04

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blank space only as many letters as are required need be brought into view. The device is used in arranging letters to spell short words after which the words are to be copied on a slate to fix them in the memory. This invention has been patented by Mr. Albert M. SPENCER'S IMPROVED HAY RAKE. A FROST PROOF TRAP FOR CAR HEATING., scientific american, 1887-06-04

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