It is perhaps best adapted for the printing of newspapers or magazines having circulations that do not require rotary machines intended for long runs.
In the first method reciprocating bells, or piston machines, or rotary machines of varying capacity like gas-works exhausters, are employed.
In the engineering industries milling machines constitute a very important class of machine tools, the characteristic of which is that rotary cutters are employed for shaping the metal (see Tools).
He cleared his throat, as if ready to address a Rotary luncheon.
As a substitute for Solenhofen stone it is used in a modified form of lithography, which can be performed on rotary printingmachines at a high speed.
Probably the most successful one has been a rotary engine invented by Mr Arthur Rigg.1 In this engine the stroke, and therefore the amount of water used, can be varied either by hand or by a governor while it is running; the speed can also be varied, very high rates, as much as 600 revolutions a minute, being attainable without the question of shock or vibration becoming troublesome.
Of polarimeters for the study of rotary polarization there are three principal forms. In Wild's polaristrobometer, light from a soda flame, rendered parallel by a lens, is polarized by a Nicol's prism, and after traversing the space into which the active substance is to be inserted, falls on a Savart's plate placed in front of an astronomical telescope of low power, that contains in its eyepiece a Nicol's prism, which with the plate forms a Savart's analyser.
For example Raps in 1893 described an automatic arrangement to be used in connexion with a Tdpler pump; whilst in 1893 Schulze-Berge devised a rotary form.
Absence of rotary power when asymmetric carbon atoms are present, may be caused by an internal compensation within the molecule as with the inactive tartaric acid (mesotartaric acid), or may be due to the fact that the compound is an equimolecular mixture of leftand right-hand varieties, this being the case with racemic acid that was broken by Louis Pasteur into laevoand dextro-tartaric acid (see Stereo-Isomerism).
A similar rotary property is possessed by other uniaxal crystals, such as cinnabar and the thiosulphates of potassium, lead and calcium, and as H.