A pocket spectrophotometer

Straylight error in a spectrophotometer.

HE PRINCIPAL SUBJECT MATTER of this paper is the description of a thod of obtaining a calibration curve relating apparent absorbancy 81) and concentration (x). It is frequently observed that the orbancy index decreases with increasing concentration in cases in ich one would expect Beer’s law, A = log(10/I) = KX, to hold. For ample, with our instrument, the absorbancy index at 273.5 m of a lutio...

Suction spectrophotometer cell.

A spectrophotometer cuvet is described which is emptied by suction without removal from the instrument. The use of this cuvet saves time and minimizes the chance of breakage. Data from C " measurements and absorbances of a dye solution show minimal retention error from successive specimens. expended in determining the absonbances of a large series of individual samples in a spectrophotometer ca...

Energy Efficiency Analyses of Toolpaths in a Pocket Milling Process

This paper presents an approach to analytically determine the most energy efficient toolpath strategy in mechanical machining. This was achieved by evaluating the electrical energy requirement of the NC codes generated for the zag, zigzag, and rectangular contour toolpath strategies. The analytical method was validated by performing pocket milling on AISI 1018 steel with the considered toolpath...

A Pocket Obstetrics

is not recommended apart from a few patients in whom radical surgery is recommended. Various clinical trials are described-the use of radium only or combined with deep X-ray therapy either before or after the insertion of the radium, etc. One read with surprise that the cure rate is no better than in 1932. The better figures reported are due to the patients receiving treatment earlier. The revi...

A Pocket Surgery