..."the designations given by the opticians to their objectives are often far from representing their focal .length, as estimated by that of single lenses...that if an objective of a certain focus will show a test object as well as another of higher focus, the former is to be preferred. Thus it happens that...

..."the designations given by the opticians to their objectives are often far from representing their focal length, as estimated by that of single lenses...underrate them being afforded by the consideration that if ¡in objective of a certain focus will show a test object as well as another of higher focus, the former...

...' the designations given by the opticians to their objectives are often far from representing their focal length as estimated by that of single lenses...that if an objective of a certain focus will show a test object as well as another of higher focus, the former is to be preferred. Thus it happens that...

...something else." He calls those correctly named, honest; by implication, those not so named, dishonest! temptation to underrate them being afforded by the...that if an objective of a certain focus will show a test object as well as another of higher focus, the former is to be preferred. Thus it happens that...

...something else." He calls those correctly named, honest; by implication, those not so named, dishonest. temptation to underrate them being afforded by the...that if an objective of a certain focus will show a test object as well as another of higher focus, the former is to be preferred. Thus it happens that...