Transactions . tating + -^^c. in the circumstances just mentioned. Obliquity observed,in degrees. Neutralizesglass. 21 )321 j- - 60 27 )30 [35 ) - 48 37i)39 f -42 42 ) 43 \ - 36 47 ; 48 [ 49 ) -30 48 )50 f - 24 50 + )52-52i \ -20 Obliquity observed, Neutralizes in degrees. glass. 52 ) 53+ [ - 18 55 ) 54 ) 55 I - 16 57 1 56 )58 \ - 15 56 ) 58 I - 14 59 ) 58 ) 59 - - 13 61 ) 60 ) 61 \ - 12 APPENDIX TO THE PRECEDING COMMUNICATION. On the refraction by a glass plate of an obliquely incidentplane pencil whose axis is perpendicular to the intersec-tion of the plane pencil with the first surface of t
Transactions . tating + -^^c. in the circumstances just mentioned. Obliquity observed,in degrees. Neutralizesglass. 21 )321 j- - 60 27 )30 [35 ) - 48 37i)39 f -42 42 ) 43 \ - 36 47 ; 48 [ 49 ) -30 48 )50 f - 24 50 + )52-52i \ -20 Obliquity observed, Neutralizes in degrees. glass. 52 ) 53+ [ - 18 55 ) 54 ) 55 I - 16 57 1 56 )58 \ - 15 56 ) 58 I - 14 59 ) 58 ) 59 - - 13 61 ) 60 ) 61 \ - 12 APPENDIX TO THE PRECEDING COMMUNICATION. On the refraction by a glass plate of an obliquely incidentplane pencil whose axis is perpendicular to the intersec-tion of the plane pencil with the first surface of the PLATE. Consider (see Fig. 2) a plane pencil ARE incident obliquelyupon a glass plate, and such that the axis AP of the pencil is perpen- of the lens by altering its obliquity. An inch from the oblique lens, betweenit and the test-letters, is a ijlace for another glass, spherical, or, if desired,cylindrical. 323 <]i(Milar to the intersection liB of the pencil with the anterior sur-face of the j)hite. Fig-2. RPBSP S represents a plate of glass with plane parallel is ijerpendicular to the is the origin of the plane pencil of liglit considered,a = angle = B AP.)8 = = RPB = CBK. RR is circular arc in first surface, about P, with radius is tangent to RR at R. SA is circular arc in second surface, about P, with radius is tangent to SA at is the course of ray is perpendicular to surfaces of the K is loeipendicular to surfaces of the plate.•>-2 324 It is proposed to find where this pencil, when refracted, intersectsthe second surface of the AP = pPP = twe have SP = SK + RP = p tang, a + t tang. /3 SP= SP sec. 7 = p tang, a sec. y + t tang. /3 sec. y [1]CP— BP+ CIv=: p tang. K + t tang, k = p tang, a sec. y + t tang, k [2] since tang, k = tang, a sec. y [3] Rays from A to arc PiR will, after refraction, meet the second sur-face in arc SA. But rays from A to RB will meet the secondsurface betwe
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectophthalmology, bookye
