摘要:
Apparatus for sensing the position by received radiation in which a multiplicity of discrete sensors are spaced in at least one sensing direction and are connected in at least two groups, the density of sensors in each group ranging along the sensing direction, each group having a different variation and at least one sensor in each group being affected by received radiation. The ratio of the sum of the influence of radiation on one group to the sum of the influence on all groups gives a measure of the position of received radiation.
摘要:
Compounds of the formula ##STR1## wherein R.sub.1 is alkyl; R.sub.2 is alkyl, aryl or aralkyl; R.sub.3 is hydrogen or alkyl or R.sub.2 and R.sub.3 together is polymethylene; and R.sub.4 is 2,6-dihalobenzyl are useful as herbicides.