k containingthe cylindrical lenses has the same arrangement as theone containing the spherical, as mentioned above.There is an eye piece for the eye being examined, while the other will be deeply shaded, thus practically dis-posing of the inclination to convergence. The reasonfor this is that… … at 11 inches should have a diameter of JJ of a line, orfor practical purposes j of a line. For the purpose ofkeeping a record of visual acuteness, as by the methodof Snellen, when the smallest letters can be read,which are j of a line in diameter, it may be stated thatV = |(J. When the next letters…
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