Abstract: A machine and procedures for accurately calibrating a mammographic X-ray machine to give accurate, absolute readings of breast tissue density. A sensor to automatically measure the distance apart of the breast retaining plates to a high accuracy, an accurately calibrated sensor to measure the voltage applied to the X-ray tube, an accurately calibrated sensor to measure the current flow to the X-ray tube, A computer interfaced scanning analogue to digital converter to accurately read and store the readings of the spacing sensor and the voltage and current sensors, A digital computer to control and read the scanning analogue to digtal converter, read the radiation detector array used to record the image, to insert the calibration plates to do the calibrations and analyze the data and a program to compute the radiation for optimizing the radiation exposure for a given patient.

Abstract: A fighting chair for boating big gamefish that is energy efficient and ergometric. The major advantages of the Energy Efficient Fighting Chair over prior fighting chairs is: 1 It allows better use of all major muscle groups in fighting a fish, especially the strongest muscle group, the leg muscles. 2 the design allows a significantly greater amount of line to be recovered per stroke of the rod. 3 The gimbaled rod butt pivot, rest, is highly adjustable and can have more than one pivot and gimbal installed so the rod position can be adjusted to accommodate differences in where the fish is positioned, the geometry of the rod and angler's physiology.