Utilizing a sample turntable

Claim 1

AN AREA PHOTOMETER COMPRISING, IN COMBINATION, AN ELONGATED GENERALLY LIGHTPROOF BOX HAVING A LIGHT COMPARMENT AND A METERING COMPARTMENT, SAID LIGHT COMPARTMENT HAVING A SUBSTANTIALLY CONSTANT LIGHT SOURCE THERIN, A PARTION GENERALLY SEPARATING SAID COMPARTMENTS, A TUBE EXTENDING LONGITUDINALLY IN SAID METERING COMPARTMENT, SAID TUBE HAVING ONE END EXTENDING TO SAID PARTITION AND OPENING THERETHROUGH TOWARD SAID LIGHT SOURCE, A PHOTOCELL EXTENDING SUBSTANTIALLY ACROSS SAID TUBE AT A POSITION ALONG SAID TUBE SPACED FROM SAID ONE TUBE END, A TURNTABLE FOR A SPECIMEN ROTATBLY MOUNTED WITHIN SAID TUBE BETWEEN SAID CELL AND SAID ONE END OF SAID TURNTABLE, SAID TURNTABLE BEING DISPOSED SUBSTANTIALLY PARALLEL TO LIGHT RAYS PASSING THROUGH SAID TUBE, MEANS FOR ROTATING SAID TURNTABLE AT A SELECTED SPEED ABOUT A ROTATIVE AXIS NORMAL TO SAID LIGHT RAYS, INDICATOR MEANS FOR ELECTRICALLY INDICATING THE OUTPUT OF SAID PHOTOCELL IN THE COURSE OF USE OF SAID PHOTOMETER, AND CIRCUIT MEANS FOR CONNECTING SAID INDICATOR MEANS TO THE OUTPUT TERMINALS OF SAID CELL.