H. L. Smith on a new Binocular Eye-piece. 43 
» achromatic, I sent to Messrs. Powell & Leland a de- 
ork, 
It apppears that the plan they had adopted was that which 
I had, more than six months previously, suggested to Mr, 
Wales, and which I had laid aside for the more perfect form. 
Evidently, the use of the Illuminator, as they constructed it, 
with a reflector of plate glass, first suggested the idea to them. 
Indeed, such an application could hardly have escaped the 
notice of those clever opticians. Shortly after, came a descrip- 
tion of Mr. Wenham’s improvement on Pow ell & Leland’s ar- 
rangement, and which was said to afford a light ‘nearly equal — 
in each tube. 
As this accomplished all I had been experimenting for, I 
gave the subject no further attention until after my return from 
England a few months since. I learned while there, that Mr. 
Wenham’s contrivance » was considered een > it Te- 
was very faint. 
Wenham, it is fair to say, alludes to the employment of 
a ery. thin wedge as a substitute for Powell & Leland’s thick 
n his paper i . 
jay 1866, and also, 
ia s reflected i ‘Messrs = 
