ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1923.tb17728.x

出版商:Blackwell Publishing Ltd    

年代:1923

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1923.tb17729.x

出版商:Blackwell Publishing Ltd    

年代:1923

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1923.tb17730.x

出版商:Blackwell Publishing Ltd    

年代:1923

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1923.tb17731.x

出版商:Blackwell Publishing Ltd    

年代:1923

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1923.tb17732.x

出版商:Blackwell Publishing Ltd    

年代:1923

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1923.tb17733.x

出版商:Blackwell Publishing Ltd    

年代:1923

数据来源: WILEY

摘要:

ABSTRACTRates of Heating by Convection and by Radiation in a Muffle Kiln, 38°×18°× 36° high, were each determined for temperatures from 350° to 800°C from measurements with a steady flow water calorimeter whose surface was first gold plated and then covered with a mixture of platinum black and lamp black. Taking the reflecting powers as 91 and 4 per cent, respectively, for the two surfaces, the radiation heating increases approximately according to the Stefan‐Boltzmann fourth power law, while the convection heating comes out proportional to the temperature difference between calorimeter and muffle; that is,C=γ(T‐t) where γ= 2.34×10−4gm. cal./cm.2sec. The ratio of convection to radiation decreases from about .40 at 350° to .10 at 800°C, so that for the higher temperatures the convection heating may be neglected in rough computations of the rate of heati

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1923.tb17734.x

出版商:Blackwell Publishing Ltd    

年代:1923

数据来源: WILEY

摘要:

ABSTRACTClear thinking on color is important. The Munsell System clarifies; shows color in three dimensions: hue, value, chroma. The method of measuring color on solid, sphere, irregular solid, vertical and horizontal slices through the solid. Method of notation. Summary.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1923.tb17735.x

出版商:Blackwell Publishing Ltd    

年代:1923

数据来源: WILEY

摘要:

ABSTRACTThis paper deals with the small problems which arise in the plaster shop, and are a source of annoyance and cost if handled incorrectly. The grade of plasters used, manner of handling, method of payment, extent of reinforcement of molds, care of benches, correct procedure in making the various parts and types of molds, are all touched on.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1923.tb17736.x

出版商:Blackwell Publishing Ltd    

年代:1923

数据来源: WILEY

摘要:

ABSTRACTA discussion of the proper type of man to develop for mitre cutting, with hints as to quick and easy ways of doing the various processes involved in cutting and sticking mitres.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1923.tb17737.x

出版商:Blackwell Publishing Ltd    

年代:1923

数据来源: WILEY