Philosophical Transactions of the Royal Society of London, Volume 108W. Bowyer and J. Nichols for Lockyer Davis, printer to the Royal Society, 1818 |
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Pagina 49
... object glass of the micrometer microscope is of one inch focus , the distance from the object glass to the spider's threads 3,25 inches , the focus of the compound eye - glass rather less than one inch , the magnifying power 18 times ...
... object glass of the micrometer microscope is of one inch focus , the distance from the object glass to the spider's threads 3,25 inches , the focus of the compound eye - glass rather less than one inch , the magnifying power 18 times ...
Pagina 50
... object glass is of three quarters of an inch focus , and the magnifying power consequently greater . The mi- crometer head is divided into one hundred parts . Each microscope slides in a tube , which is fixed in a plate of brass forming ...
... object glass is of three quarters of an inch focus , and the magnifying power consequently greater . The mi- crometer head is divided into one hundred parts . Each microscope slides in a tube , which is fixed in a plate of brass forming ...
Pagina 52
... object precisely in the same plane with the threads , and the image will conse- , quently be of various dimensions , according to its distance from this plane . Unless , therefore , the most minute atten- tion be paid to the adjustment ...
... object precisely in the same plane with the threads , and the image will conse- , quently be of various dimensions , according to its distance from this plane . Unless , therefore , the most minute atten- tion be paid to the adjustment ...
Pagina 58
... objects . The knife edge now appeared through the microscope , as a well defined dark object on a white ground . Marks were made on the paper close to the knife edges at equal distances on each side of the bar . These were in- tended to ...
... objects . The knife edge now appeared through the microscope , as a well defined dark object on a white ground . Marks were made on the paper close to the knife edges at equal distances on each side of the bar . These were in- tended to ...
Pagina 59
... objects on a white ground , and also when they were seen as light objects on a black ground . The difference of such readings will obviously give double the correction required . The results are contained in the following table ...
... objects on a white ground , and also when they were seen as light objects on a black ground . The difference of such readings will obviously give double the correction required . The results are contained in the following table ...
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Veelvoorkomende woorden en zinsdelen
20 feet telescope 24 hours ammonia angle appear Aquila ascertained axes axis Azimuth Barom barometer barytes BIOT blood bones calcareous spar carbonate centre chlorine Clock cluster of stars coagulum colour compression connoissance crystals DALTON Daumergidda deduced degree determined double refraction elastic force equal equation experiments glass globules Hazy heat hypophosphorous acid inches index error knife edges latent heat latitude length lime MDCCCXVIII mean measure mercury meridian mètre micrometer microscope muriatic muriatic acid Namthabad nearly number of vibrations obtained oxygen parallax Patchipolliam pectoral fin pendulum phenomena phosphoric acid phosphorus plane plate polar distance polarising force pole position potash prism produced profundity Punnæ purpurate quantity rectangular right ascension scale Sin.² Slider specific gravity sternum strontian sulphate supposed surface SW 1 Cloudy Temp temperature Therm thermometer thickness tints tion tube turnsol vapour Vibrations in 24 weight