Show A scientific INVENTION an instrument which B cord the carletha Carle toA college observatory has secured a curious instrument invented by a scientist at nd called a personal equation machine says a northfield letter to the st paul pioneer press the object of the instrument I 1 ia to h the observations of different persons who are working together at or ai the same time astronomers well know thata no two par sons see exactly alike by which is example no will sa th at aa star passes a alfon autele i echop exactly at the same instant one in apparent passage slav on true time while anether will almost put its time fast observers i unconsciously form a habat of seeing objects fast or alow on true time and trier better the observers the more steady thia error is as COBI pared true time this error the astronomer calls the pe bonal equation of jhb observer in amount the personal equation varies arom 0 a second of dimeto some thins mo halt a second for different observers slow on true time Such errors ai lese can not 6 tolerated ai all in astronomical observe eions for b original work ot nipe must bo in some way eliminated boford final reductions can be attempted to accomplish this in one wayan awayan ip genious machine has been constructed which sets in motion an quite like the appearance 0 s tn the telescope As this artificial str passes esIth ema chine iho observer records h is observations and thein the exact thereal the real passage at tact star over the same wires now both records are made by the aid odthe electric current and consequently are perfectly true ahse records au ally in ink on an instrument called a chronometer and hence their differences cabbe measured with fhe accuracy and thy etoir bf faiq on true time is satisfactory kiy known y the machine is 11 use together by singly so ual personal equations may be detected ast well as tsa d between betwee a observers therefore burnish tur nish ea standard for acab rate |