158 THE MICROSCOPE. 
evening Mr. H. J. Grose, druggist, and I called at Mr. Fasoldt’s 
place of business and requested an exhibition of his handiwork. 
He received us kindly, and very interestingly entertained us for 
over two hours. 
The rulings were shown through the microscope with the aid of 
Mr. Fasoldt’s new “ Vertical Illuminator.” 
The plates were ruled in bands with lines alternately longer and 
shorter, beginning with 5,000 lines to the inch and increasing in each 
band up to 30,000; after that 10,000 in each band up to 250,000. 
Our examination commenced with the band of 90,000. In the band 
of 100,000 Mr. Grose and I counted every line on the ends and 
compared them with the U. S. standard of measurement, using a 
micrometer which is composed of three very delicate steel prongs, 
arranged thus |'). 
The first lower prong was placed stationary over the first line 
of the band of 100,000, the upper prong over the second line, the 
next lower prong over the third line, and again the upper prong 
over the fourth line, and then alternately moving the two latter 
prongs until the upper one was placed directly over the 50th line of 
the band ruled 100,000 lines to the inch, every line of which we saw 
distinctly. : 
The distance between those 50 lines represented 5,5, part of 
an inch. 
Mr. Fasoldt commenced his exhibition where scientists have 
heretofore been supposed to discontinue their labors. 
This test-plate was then removed from the stage and a 
micrometer (U. S. standard) placed thereon, the prongs of the 
micrometer heretofore used remaining as stationed in the eye-piece. 
The lines of the U. S. Standard, 2,000 to the inch, were brought into 
focus. The space between two of these lines corresponded exactly 
with the space between two of the prongs, thereby proving the 
truthfulness of Mr. Charles Fasoldt, Sr’s., claims and the accuracy 
of his rulings. 
We then proceeded with the finer rulings, satisfying ourselves 
of their accuracy, until the 230,000 band was brought into focus. 
We saw the lines, but not distinct enough to be resolved. 
Several evenings afterwards Mr. Grose and I called again to 
convince ourselves that we had actually seen what we claimed. Mr. 
Grose said that he resolved the 220,000 band, but not as clearly as 
on the first evening; but on the contrary I saw the lines and space 
between the lines and resolved them in the 220,000 band. In the 
230,000 band I saw the lines, but not sufficiently distinct to say that 
I resolved them. 
