Hall in 1733 constructed achromatic lenses.
The turf is taken off either with the breast plough - a paring tool pushed forward from the breast or thighs by the workman - or with specially constructed paring ploughs or shims. The depth of the sod removed should not be too thick or burning is difficult and too much humus is destroyed unnecessarily, nor should it be too thin or the roots of the herbage are not effectually destroyed.
Cisterns were also used for the storage of rain water, and aqueducts, of which the remains still exist (see Aqueducts ad inst.), were constructed for the conveyance of water from a distance.
The stiffening girder, constructed chiefly of timber, was a box-shaped braced girder 18 ft.
A telegraph line was constructed between Lanchow in the Chinese province of Kan-su and Turfan in 1893.
Its earliest trade was in the salt produced at Halle, and its enterprising inhabitants constructed roads and bridges to lighten the journey of the traders and travellers whose way led to the town.
We have a combination in the same flower of stalked ovules, the structure of which has already been described, and interseminal scales constituting a complex gynoecium, which exhibits in certain features an approach to the angiospermous type, and differs in structure from other Gymnosperm flowers, associated with male organs constructed on a plan almost identical with that.
The citadel (Rocca Ravaldina), constructed about 1360-1370, and later rebuilt, is now used as a prison.
They are constructed for the measurement not only of continuousor unvarying butalsoof alternating currents.
From the spoils of the war he constructed the first public library at Rome, in the Atrium Libertatis, also erected by him (Pliny, Nat.