摘要:

Abstract.The practice of coating glass surfaces in order to reduce the reflected and increase the transmitted light is now well known, but little attention has so far been given to the particular problems presented by the microscope objective. It will be shown that much can be done to improve observing conditions when a cover‐glass illuminator is used, and in this connection the requirements of the metallurgist will receive special consideration. It will be shown that the coating of glass surfaces may result in a marked diminution of fogging light and to enhanced contrast in the image, and also in the more efficient operation of tbe cover‐glass illumina

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1945.tb00926.x

出版商:Blackwell Publishing Ltd    

年代:1945

数据来源: WILEY

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1945.tb00927.x

出版商:Blackwell Publishing Ltd    

年代:1945

数据来源: WILEY

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1945.tb00928.x

出版商:Blackwell Publishing Ltd    

年代:1945

数据来源: WILEY

摘要:

Summary.Electronmicroscopical examination of (carbonyl) nickel powders consisting of particles a few microns in diameter has revealed two types of powder consisting respectively of (a) a mixture of irregularly shaped and cube‐shaped particles each with rough surfaces and(b)characteristically shaped particles with smooth surfaces. The form of the smooth surfaced particles could not be determined until evidence from the electron microscope was combined with evidence from the light microscope. It was then inferred that the smooth‐surfaced particles were single crystals in the form of icositetrahedra, probable indices of faces {5

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1945.tb00929.x

出版商:Blackwell Publishing Ltd    

年代:1945

数据来源: WILEY

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1945.tb00930.x

出版商:Blackwell Publishing Ltd    

年代:1945

数据来源: WILEY

摘要:

Synopsis.FRESHLY gathered marine diatoms when placed upon an agar medium ejected their protoplasmic masses from the siliceous frustules. The naked cells, enclosed within an intact perizonium, continued to live upon a solid medium for more than nine months, during which they lost their normal shape and power of locomotion. When the cells were returned to an aqueous medium, either static or flowing, they became rehabilitated, re‐establishing their naviculoid form and regaining their power of movement.This work was undertaken at the Admiralty Central Metallurgical Laboratory, Emsworth, and forms part of a general investigation into the r81e of “first colonist” organisms on surfaces immersed in seawater, in connection with the antifouling problem of ships'

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1945.tb00931.x

出版商:Blackwell Publishing Ltd    

年代:1945

数据来源: WILEY

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1945.tb00932.x

出版商:Blackwell Publishing Ltd    

年代:1945

数据来源: WILEY

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1945.tb00933.x

出版商:Blackwell Publishing Ltd    

年代:1945

数据来源: WILEY

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1945.tb00934.x

出版商:Blackwell Publishing Ltd    

年代:1945

数据来源: WILEY