Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3671928A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BENJAMIN DISRAELI RITHOLZ
Original Assignee
BENJAMIN DISRAELI RITHOLZ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BENJAMIN DISRAELI RITHOLZfiledCriticalBENJAMIN DISRAELI RITHOLZ
Priority to GB3671928ApriorityCriticalpatent/GB324185A/en
Publication of GB324185ApublicationCriticalpatent/GB324185A/en
A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
Abstract
324,185. Ritholz, B. D. Dec. 12, 1928. Sight-testing apparatus of the kind in which an eyepiece 12 and a lens mounting 7 are associated with a chart member 19 slidable on a scale Bar 10, is provided with a vertically disposed eyeshield 18 mounted on the eyepiece and projecting laterally at both sides to obstruct the view of the eye not under test. The chart member 19 is recessed to fit over the bar 10 and is fitted with a bottom strip across the recess. The member 19 is provided with a reading chart on one side and an astigmatic chart on the other and is reversible.
GB3671928A1928-12-121928-12-12Improvements in eye testers
ExpiredGB324185A
(en)
Mechanisms applicable to calculating machines, price indicators and recorders for automatic scales, average quantity indicators, regulators, reproducers and the like