A photoelectric adapter is described for making measurements of spectral line intensities in
the visible and ultra-violet regions. Two integral multiplier photocell units are mounted in a …

A review is made of published accounts of double-beam attachments for
spectrophotometers, for use in the visible and ultra-violet region. A simple alternate-path …

A simplk microphotometer utilizing a photoelectric cell and bridge amplifier and a directly
coupled recording camera is described. MEASUREMENTS are frequently required of …

A digital computer has been programmed to find and measure spectral lines using a list of
transmission values at equal intervals along a spectrum plate. The apparatus for making the …

For the measurement of spectral plates, especially if one measures for a long time at a
stretch, it has often been found that the usual types of comparator, equipped with …

The sensitive surfaces of two Weston Photronic cells have been combined into a single
photometer cell such that a simple null method of photometry is available. The sensitivity of …

The Spectrophotometer part of the apparatus (shown in plan and elevation in figs. 1 and 2
and in fig 3) was designed and constructed in the workshop of Messrs. Adam ttilger Ltd …

A National Technical Laboratories Model DU Quartz Spectrophotometer has been converted
into an automatic recording spectrophotometer by (a) utilizing the monochromator with …

A relatively compact bench mounted projector-comparator is described. With it any section of
one 10× 4 in. spectrographic plate may be compared with any section of another. Thus it is …

Procedures are described which permit the use of an optical filter with sharp absorption
bands to supplement emission line data in the laying out of a wave-length cam for a …