We have carried out a detailed abundance analysis for 21 elements in a sample of four RGB stars in the outer halo globular cluster NGC 7492 ( R _ { GC } 25 kpc ) ; we find [ Fe/H ] = -1.82 dex inferred from Fe I lines ( -1.79 from Fe II ) using high dispersion ( R= \lambda / \Delta \lambda =35,000 ) spectra obtained with HIRES at the Keck Observatory .
Most elements show no sign of star-to-star variation within our limited sample .
We have , however , detected an anti-correlation between O and Na abundances similar to that seen in our previous analyses of inner halo GCs as well as in studies of relatively nearby GCs by others .

We compare the abundance ratios in NGC 7492 with those we previously determined for the much closer old halo GCs M3 and M13 .
After making corrections for trends of abundance ratio with metallicity characteristic of halo stars , we find that for for these three GCs for each of the elements in common we deduce identical abundance ratios with respect to Fe to within the probable measurement uncertainties .
Thus , the chemical history of the outer halo as exemplified by the metal-poor outer halo globular cluster NGC 7492 is indistinguishable from that of the inner halo , exemplified by M3 and M13 , at least through the epoch of formation of these old globular clusters .
This applies to the neutron capture processes as well .