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Volume 11 (1927)
- Issue 6 Pages 273-
- Issue 5 Pages 227-
- Issue 4 Pages 173-
- Issue 3 Pages 127-
- Issue 2 Pages 53-
- Issue 1 Pages 17-
Volume 11, Issue 5
Displaying 1-5 of 5 articles from this issue
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R. Mitsuda1927 Volume 11 Issue 5 Pages 227-232
Published: 1927
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSA building must be installed by various equipments, without which the building cannot be said to be perfect: the equipments are, so to speak, vesse's, nerves and other important internal organs of the building.
Increased demands for electricity in our daily life has brought about the necessity for the better electric equipments.The electric equipments, which have been apt to be neglected as mere auxiliary installations, are nowadays becoming more and more important; the safety of the installations and the certainty of their action should be aimed at to assure the safety of public and promote their activity.
The author discusses in details what kind of precautions and preparations should be necessary for the designers, supervisors, contractors and engineers on instaling the electric equipments.View full abstractDownload PDF (1079K) -
T. Matsuura, T. Iijima1927 Volume 11 Issue 5 Pages 233-240
Published: 1927
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIndirect and artifical skylight illumination were equipped in the hall of Mazda Lighting School a Kawasaki.
Design and test data were compared.
The illumination efficiency in the case of indirect source, concealed in the cornis, was found to be somewhat low compared with the case of ordinay indirect bowls.
Artificial skylight illumination was only half of the designed value It owes to the low efficiency of the opal glass obtained at market, its transmission was very low compared with that used for ordinay luminairs.View full abstractDownload PDF (6012K) -
Ziro Yamauti1927 Volume 11 Issue 5 Pages 241-259
Published: 1927
Released on J-STAGE: March 02, 2011
JOURNAL FREE ACCESSThe formulas by which we can calculate the direct illumination due to light from rectangular source of uniform brightness are apparently rather complicated.The author shows that they are not so in reality and how easily they can be calculated, with simple nomographic charts, especially for the case in which the sides are parallel to the illuminated surface. The daylight factor and sillfactor-ratio for direct illumination, too, can be deduced.
To calculate the incident flux on a rectangular area, which is parallel or perpendicular to the source, when a pair of opposite sides of the former is parallel to that of the latter, Lambert';flux function may be used.The author shows another flux function, which is expressed by
phi; (ω) =1/2(ω-1/2 tan ω log sin ω + 1/2 cot ω log cos ω)
which has the relations
φ (ω) =tan ω·φ (ω)
where φ (ω) is Lambert's,
and φ (ω)+φ(π/2-ω)=π/4·
The value of φ (ω) is always finite while that of φ (ω) becomes infinite if φ approaches π/2. φ (ω) can be easily interpolated.
Making use of two reciprocation theorems, we can express generally the amount of incident flux on a rectangle, emited from another rectangular source which is perpendicular or parallel to the former and whose one side is parallel to that of the former. Those expressions ate algebraic sum of the function F (x, y) which is xyφ [tan-1 (x/y)].View full abstractDownload PDF (1436K) -
1927 Volume 11 Issue 5 Pages 260-266
Published: 1927
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (720K) -
1927 Volume 11 Issue 5 Pages ex77-ex85
Published: 1927
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (1034K)
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