LM317T Resistor Values
Based on the information in your schematic the voltage across the 3300 uf capacitor should be about 25 VDC which is the peak voltage of the 18 VAC at the secondary of the transformer.  Since you are only getting 0.752V, something is clearly amiss.  Try disconnecting pin 3 of the LM317T and then measuring the voltage across the 3300 uf capacitor.  If it is about 25 VDC, then something is wrong with either your wiring or the LM317T.  If it is not, then you have a problem with either the transformer, rectifier, or capacitor.  In any case, I believe that your choice of values for R1 and R2 will not work in this circuit. The LM317T contains a 1.25V reference that appears across pins 1 and 2.  The voltage divider formed by R1 and R2 causes the LM317T to change its output voltage to keep the 1.25V across R1.  That is the basis of the first term of the equation for the output voltage.  The problem is the second term. The LM317T outputs a small current from pin 1, designated as IADJ, which is nominally about 50 microamperes.  This current flows through R2 and increases the output voltage by IADJ X R2 which accounts for the second term in the equation. When the recommended value of 2K is used for R2, this second term  becomes 50 microamperes X 2K or 0.1V which is small compared to the usual output voltage of the LM317T.  Also, the LM317T is designed to keep IADJ constant with temperature so as to not affect the stability of the output.  However, you are using 100K for R2, so that IADJ now causes the output voltage to increase by 50 microamperes X 100K or 5 volts.  This is a large fraction of the expected output voltage and could go as high as 10 volts since the specified maximum for IADJ is 100 microamperes. The data sheet is not clear on this point but I believe the designers expect the current through R1 to be much greater than IADJ.  With the recommended value of 220 ohms, the current through R1 is 1.25V/220 or 5.68 milliamperes which is 57 times higher than IADJ.  With R1 equal to 10k, the current drops to 0.125 milliamperes or 125 microamperes which is only 1.25 times the maximum value of IADJ.  I strongly suggest that you find a pot much closer to 2k, lower the value of R1 accordingly, and try the circuit again.