Encyclopaedia; or, A dictionary of arts, sciences, and miscellaneous literature; constructed on a plan, by which the different sciences and arts are digested into the form of distinct treatises of . ^/y</. MScof (? ///„jr//r,. lli Part II. O I s. 343 Of Aberra- fuflers no rsfrad^I n!. But tlieve is no fiich fucus. But je^l fliall be treated in tl;e prefent general fkotch, will Of Ak-rra if we make inllV—»RC : »il^ting die problem for the extremepoint of thi; given arch. It is evident from the conRruflion, that while thepoint cf incidence P is near to V, the line CllK in-cre
Encyclopaedia; or, A dictionary of arts, sciences, and miscellaneous literature; constructed on a plan, by which the different sciences and arts are digested into the form of distinct treatises of . ^/y</. MScof (? ///„jr//r,. lli Part II. O I s. 343 Of Aberra- fuflers no rsfrad^I n!. But tlieve is no fiich fucus. But je^l fliall be treated in tl;e prefent general fkotch, will Of Ak-rra if we make inllV—»RC : »il^ting die problem for the extremepoint of thi; given arch. It is evident from the conRruflion, that while thepoint cf incidence P is near to V, the line CllK in-creafes but very little, and therefore CF dimiuilheslittle, and the refrafled rays are but diflufed fr-mF; andthereibre they are much denierin its vicinity thanany other point of the axis. It foon be evidentthat thsy are incomparably denftr. It is on this ac-count thai the point F has been called the- conjugatefocus k«t iS-x-i to I^) ^-d the geometrical locusand the diffufioa has been calle
Size: 1543px × 1619px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1700, bookdecade1790, bookidencyclopaedi, bookyear1798
