James Dunlop probably discovered NGC 1810 = D 235 = h2746 on 24 Sep 1826 and described "a small round pretty well defined nebula." He made a single observation and his position is 11' south-southeast of the cluster. It's also possible that this observation refers to brighter NGC 1818 -- along with D 234 and D236, though the latter two are placed south of D 235, agreeing with orientation of NGC 1810 and 1818.

JH made a total of 5 observations beginning on 6 Nov 1834. In order of his observations, he logged "eF, S, R, 15", precedes a globular cluster.", "vF, R, lbM, 40 arcsec", "F, S, R", "pF, R, lbM, 25 arcsec" and "Nebula; no description but that it has a globular cluster following it." The cluster he refers to is NGC 1818 and Herschel attributed Dunlop's 235 with the discovery.

600/800mm - 30" (11/4/10 - Coonabarabran, 264x): moderately bright cluster, fairly small, 45" diameter, partially resolved with 4 or 5 stars visible on the east side of the halo including a couple of mag 13.5-14 stars. Located 2.6' ESE of mag 10.3 HD 268879. A mag 12.5 star lies 45" N. Forms a pair with brighter NGC 1818 6' SE. S-L 205 lies 8.4' ENE.

Notes by Steve Gottlieb