A Direct-Reading Device for Use in Computing Characteristics of Vacuum Tungsten Lamps (with Computing Chart) Page: 269
269-288 p. : ill. ; 26 cm.View a full description of this report.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
DEPARTMENT OF COMMERCE
BULLETIN
OF THE
BUREAU OF STANDARDS
Vol. 12.. No. 2-.
A DIRECT-READING DEVICE FOR USE IN COMPUTING
CHARACTERISTICS OF VACUUM TUNGSTEN LAMPS
(WITH COMPUTING CHART)
By J. F. Skogland
CONTENTS
Page.
I. Introduction. .................................................. 269
II. Scales of the device ............................................. 270
III. How the scales are used .......................................... 271
IV. Examples illustrating scale settings and their precision. ................ 272
V. Advantages and disadvantages. ..... ............................. 275
VI. Construction of the scales ....................................... 276
i. Range selected .............................................. 276
2. Coordinates to which all points are referred..... ............... 277
3. Watts per candle scales..........: ............................. 277
4. Normal per cent candlepower scale. ............... .. ....... 278
5. Preliminary per cent voltage scale. .......................... 278
6. Preliminary volt scale ........................................ 278
7. Use of the scales constructed above.............. ........... ..278
8. Per cent candlepower curves ................................ 279
9. Final volt scale.......................................... 281
VII. The computer in a modified form .................................. 281
VIII. Tables of values used in constructing the scales. ...................... 282
i. Volt scale .............. ................................ 282
2. Watts per candle scale. ..................................... 283
3. Per cent candlepower chart................ ................ 284
IX. Summary......................................................... 286
Instructions for chart (computing chart attached) ..................facing 288
I. INTRODUCTION
Previous work in the derivation of characteristic equations of
vacuum tungsten lamps 1 has led to the consideration of the
possibility of designing some form of computing device, the con-
struction of which would depend directly upon these equations,
and which would yield values of acceptable precision, when com-
pared with those obtained by use of the tables 2 which have
been computed from the equations.
1 Middlekauff and Skogland, "Characteristic equations of tungsten lamps and their application in
heterochromatic photometry," this bulletin, 11, pp. 483-534; 1914. (Scientific Paper No. 238.)
2 Pp. 527-534.
269
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Skogland, J. F. A Direct-Reading Device for Use in Computing Characteristics of Vacuum Tungsten Lamps (with Computing Chart), report, 1916; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc66538/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.