It doesn't fit with their alleged party objectives or any tactics they've ever employed.
- Siemens's Continuous Tank of Dollond's invention of achromatic telescope objectives in 1 757, a demand first arose for optical glass, the industry was unable to furnish suitable material.
The price, however, rapidly increases with the total bulk of perfect glass required in one piece, so that large disks of glass suitable for telescope objectives of wide aperture, or blocks for large prisms, become exceedingly costly.
Two objectives were assigned, the first running E.
Was unable to attain all its objectives and the 38th Div.
In line, despite difficulties in assembling its forces, reached its first objectives by 9 A.M., but the 6th Division was held up at Holnon, and was unable to maintain itself in Fresnoy, while the 1st Div.
A series of partial offensives were therefore undertaken on the succeeding days, on both wings of the army, but with little real result; neither corps could succeed in attaining the final objectives of the first day's attack or clear the enemy entirely from the advanced defences of the Hindenburg line.
Up to this line four successive objectives were assigned; from there onwards the second phase of the advance was to carry the assailants to the line of the Scheldt canal and the Sensee.
On the N., attacking in the afternoon, secured and held its objectives and thus eased the situation on that flank.
Five objectives were laid down, and exploitation was to be carried out beyond the final one to Welsh Ridge (N.
Passed through to continue the advance and carried the line to the outskirts of Marcoing, thus attaining all the corps' objectives for the day.
Was in possession of its objectives everywhere.
Corps was to round off its success on the right by clearing the Thorigny area on the near bank of the canal, and occupying the ground on its front as far as the Masnieres - Beaurevoir line; the Australians were to secure the remainder of the first day's objectives in its sector between Bellicourt and Vendhuille, while the III.
Corps on the right had heavy fighting, and after attaining their final objectives about 10:30 A.M.
This road system bears plain marks of having been made at different times, and with different objectives, but we have no evidence that any one part was abandoned when any other was built.
The subsequent history of the development of the art of manufacturing glass disks for telescopic objectives will be found in the article Glass: § Optical.
(2) Largest field of view; necessary corrections are - for astigmatism, curvature of field and distortion; errors of the aperture only slightly regarded; examples - photographic widest angle objectives and oculars.
Between these extreme examples stands the ordinary photographic objective: the portrait objective is corrected more with regard to aperture; objectives for groups more with regard to the field of view.
(3) Telescope objectives have usually not very large apertures, and small fields of view; they should, however, possess zones as small as possible, and be built in the simplest manner.
Photog., 1891, 5, p. 225; 18 93, 7, p. 221), cemented objectives of thin lenses permit the elimination of spherical aberration on the axis, if, as above, the collective lens has a smaller refractive index; on the other hand, they permit the elimination of astigmatism and curvature of the field, if the collective lens has a greater refractive index (this follows from the Petzval equation; see L.
This artifice is specially adopted in objectives for astronomical photography ("pure actinic achromatism").
On this account the lines D and G' are united for ordinary photographic objectives; the optical as well as the actinic image is chromatically inferior, but both lie in the same place; and consequently the best correction lies in F (this is known as the " actinic correction " or " freedom from chemical focus ").
Abbe succeeded in computing microscope objectives free from error of the axis point and satisfying the sine condition for several colours, which therefore, according to his definition, were " aplanatic for several colours "; such systems he termed " apochromatic."
This Is Produced In The Same Amount, But In The Opposite Sense, By The Oculars, Which Are Used With These Objectives (" Compensating Oculars "), So That It Is Eliminated In The Image Of The Whole Microscope.
The Best Telescope Objectives, And Photographic Objectives Intended For Three Colour Work, Are Also Apochromatic, Even If They Do Not Possess Quite The Same Quality Of Correction As Microscope Objectives Do.
The Bulgarian scheme of operations, necessarily offensive, suffered from the weakness of having two objectives - the Ovche Polye and Salonika - and being based on two main lines of communication diverging towards the rear - Kyustendil and Seres - Drama.