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January, 1927 2 MARIN E REVIEW Graphically Contrasting Unequaled Accuracy KOLSTER RADIO COMPAS {00 100 SIGNAL STRENGTH 60 LINE OF ZERO LINE OF ZERO SIGNAL STRENGTH SIGNAL STRENGTH SHARPNESS oo BROADNESS OF BEARING OF BEARING ON THE ON ORDINARY KOLSTER COMPASSES The Kolster is the original automatically compensated direct reading Radio Compass. Already in use on nearly two hundred ships, the Kolster needs no finer recommendation. f THIS SHOWS To seriously compare either a non-compensating compass or a” WITH CASE broad-bearing compass with the Kolster is like comparing an old REMOVED hand-oared galley ship to a modern liner. The simple charts above depict one great difference---the wide variance in bearing between the sharp-bearing Kolster and a broad- bearing compass. One chart shows broadness which no user could willingly desire, and no amount of sales talk can justify. The Kolster Compass is a scientific instrument, based first, last and always on accuracy. It is easily operated by the Navigator. The Kolster does not overlook the natural errors due to stacks, rigging and the like. Equipped with the Kolster Compensator, all of these natural errors are automatically nullified. Furthermore, through another exclusive Kolster improvement, sharpness of bearing becomes an accomplished fact. The Kolster Compass is sensitive, selective and dependable. Its accuracy is guaranteed. Operates with single dial tuning control, has long lasting Edison storage battery for filament current, stand- ard 6-volt vacuum tubes, occupies a minimum of space and is protected by the Kolster follow-up service. When comparing compasses look for action that proves accuracy. Demand the sharp-bearing and compensating tests--- and know the compass you select is scientifically correct er "Kolster Precision Defies Successful Imitation” Laer Full Patent Protection Guaranteed Send For Free Descriptive Booklet FEDERAL TELEGRAPH COMPANY 25 Beaver Street, New York = Rockefeller Building, Cleveland “ Hobart Building, San Francisco Please mention MARINE REVIEW when writing to Advertisers