Hydraulic fracture dimensions and, optionally, fracture closure pressure and time are determined by adding particulate matter that discharges to create an acoustic signal to the proppant, allowing the particulate matter to discharge, and detecting the acoustic signal with geophones or accelerometers. Embodiments of systems can include a pressureflow loop subsystem having an external flow loop system coupled to a specimen holder, where the pressureflow loop subsystem is capable of adjusting at least two dynamic conditions in the specimen holder or a diameter of a specimen in the specimen holder. An accessory holder 30 provided with a mounting seat 40 to which the high-pressure fuel pump 60 is attached is formed integrally with a lower camshaft holder 21 included in the camshaft holder 20. The bus includes a group of signals and a control signal associated with the group of signals. The replaceable shearing tip engages the upper jaw on at least three seats. According to the invention the secondary air distributor also comprises a fan for producing an air and combustion gas vortex inside the secondary combustion chamber and on out through the outlet to the boiler space.