Nature, Količina 64Sir Norman Lockyer Macmillan Journals Limited, 1901 |
Iz vsebine knjige
Zadetki 1–3 od 84
Stran 66
... glass . It never breaks when thrust into the flame , and finished apparatus needs no annealing . One precaution must be taken . The eyes must be protected by black spectacles . The glass of which these are made must FIG . 1 . be very ...
... glass . It never breaks when thrust into the flame , and finished apparatus needs no annealing . One precaution must be taken . The eyes must be protected by black spectacles . The glass of which these are made must FIG . 1 . be very ...
Stran 291
... glass making if the microscope were to advance , and to the necessity for obtaining glasses having a different relation between dispersion and refractive index than that found in the material at the dis- posal of opticians . Stokes and ...
... glass making if the microscope were to advance , and to the necessity for obtaining glasses having a different relation between dispersion and refractive index than that found in the material at the dis- posal of opticians . Stokes and ...
Stran 292
... glass and that of the air thermometer led to further investigations , and another glass , a borosilicate contain- ing 12 per cent . of boron , was the consequence . This glass has a still smaller depression . Previous to 1888 Germany ...
... glass and that of the air thermometer led to further investigations , and another glass , a borosilicate contain- ing 12 per cent . of boron , was the consequence . This glass has a still smaller depression . Previous to 1888 Germany ...
Vsebina
edfern famnina Mlor de im | 20 |
NAM AKARTAMA of organometallic derivatives by W E | 24 |
22 | 69 |
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acid American ampere animals Antarctic apparatus appears April Archibald Geikie astronomical British carbon carbonic acid cell centimetre chemical chemistry College colour Committee comptometer connection contains described diffusion direction effect electric engineering exhibited expedition experiments fact Geological give given glass helium hydrogen illustrated important increase Institute interesting investigation laboratory larvæ light lines liquid liquid air liquid hydrogen Liverpool London Lyrids magnetic matter means measured ment meteorological meteors method metres Museum Mycenaean natural observations Observatory obtained paper Perseids photographs physical plants plates practical present pressure Prof rays recent reference remarkable Royal Geographical Society Royal Society salt scientific silica solution species specimens spectrum stars surface telegraphy temperature theory thermometer tion tube tuberculosis University velocity volume watt-hours West Africa