What people are saying - Write a review
We haven't found any reviews in the usual places.
department of Commerce
The New Scale in Sectional Form
Special Uses of all Forms of the Scale
1 other sections not shown
16 candlepower 16-cp section 8-cp lamp accuracy adapted to photometers adjustment apparatus axis bureau candle candlepower lines candlepower values clamped cm from zero color match commercial photometer common index line comparison lamp comparison side computations correct corresponding diagonal lines diagonal scale draw the record drawn edge equation exactly fall filing card foot-candle forms group of dots Hence lamp distance lamp placed lamps compared lamps stationary linear candlepower scales linear record scale linear scale locus mean reading method middle observer paper parallel photometer bar photometer bench photometer carriage photometer screen photometer settings posi potentiometer power values printing point read off directly record dots record printed record sheet rectangle reference line respectively rotating sectored disks scale adapted sectional scale set of measurements shown in Fig six standards sliding index square standard illumination standard scale straight line test lamp test side three standards tion tometer transmission coefficient true value voltage