. Good and bad eyesight : and the exercise and preservation of vision. es areconcerned. Thursfields writing frame is made byMessrs. Elliot, the Philosophical Instrument Makers, inthe Strand, opposite the Charing Cross Railway Station,London. Another contrivance, and one of more general valueand applicability, is the American type-writer, shown inone of its best forms in Fig. 50, manufactured by Rem-ington & Sons, at Ilion, in the State of New my own hands at home, writing a very great deal,both for publication and in correspondence, thismachine has for the last four years superseded th
. Good and bad eyesight : and the exercise and preservation of vision. es areconcerned. Thursfields writing frame is made byMessrs. Elliot, the Philosophical Instrument Makers, inthe Strand, opposite the Charing Cross Railway Station,London. Another contrivance, and one of more general valueand applicability, is the American type-writer, shown inone of its best forms in Fig. 50, manufactured by Rem-ington & Sons, at Ilion, in the State of New my own hands at home, writing a very great deal,both for publication and in correspondence, thismachine has for the last four years superseded the penentirely, so that I now use the latter for no other pur-poses than to correct proofs by interlineation, to signmy name, and to address letters. The type-writer isworked by vertical keys, like those of a cornet-a-piston,having finger surfaces five-eighths of an inch in diam- 238 EYESIGHT. eter, on which the letters or figures are enamelled five-sixteenths of an inch high. The key-board contains forty-four keys, in four rows of eleven ; Fig. P=F- and the arrangement is not alphabetical, but is like thatof the compositors case, in which the letters are placednearer to the centre in the order of the frequency oftheir occurrence in words. CONTRIVANCES FOR SAVING VISUAL EFFORT. 239 Even in learning the use of the instrument, when theletters have to be looked for one by one until the fingersbecome sufficiently familiar with their several positionsto touch them instinctively, the characters are so largethat there is no appreciable strain upon vision; and,when once dexterity is attained, the eyes can scarcelybe said to be used at all. My own eyes have neveroccasioned me any discomfort; and my own use of thetype-writer rests upon quite different grounds; but yetmy experience of it enables me to recommend it, verystrongly, to all persons who, having to write much, aremade conscious by the exercise that they have the short-sighted it is especially valuable;
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