1062 RECORD OF CURRENT RESEARCHES RELATING TO 



State of Massachusetts, and there selected a Microscope objective at 

 the office of Charles Stodder, agent for Eobert B. Tolles, of said 

 Boston. Afterward on the same day I met said Tolles, the maker of 

 said objective in his manufactory on Hanover Street in said Boston, 

 and conversed with him about the manipulation of said objective. In 

 said conversation said Tolles described a device for facilitating the 

 application of light of any desired obliquity, which device he thought 

 would be possibly the best for my purpose. It was to attach to the 

 stand of the Microscope an arm vphich would rotate on an axis at the 

 level of the upper surface of the object-slide. To this arm an achro- 

 matic condenser (or objective as a condenser) could be screwed so that 

 if adjusted to bring light to a focus on the object at any one obliquity 

 it would still be in focus at any other obliquity. Said Tolles exhi- 

 bited to me a device used by him on his own stand to accomplish this 

 result. It consisted of an arm under the stage carrying the achro- 

 matic condenser, which arm was adapted to carry the condenser 

 through a considerable arc, keeping it in a radial position with the 

 centre of motion at the focus of the objective in use in the body. We 

 discussed several plans for securing the motion around the plane of 

 the upper siu'face of the object. I understood that the plan used in 

 said Tolles' stand was an adaptation of a stage not originally designed 

 for the purpose and therefore of necessity the radial motion with 

 centre in the plane of the object was obtained by some combinations 

 whose nature does not occur to me. My recollections about the radial 

 arm for oblique light from a condenser as seen by me at this time are 

 very distinct because I had then some intentions of imitating the 

 arrangement and actually afterwards made some preliminary trials 

 in that direction. In reference to my own Microscope-stand, said 

 Tolles, in said conversations suggested the making of a semicircular 

 track to be borne on the substage fitting, which should answer the 

 same purpose of carrying the condenser concentrically with the 

 object on the stage. 



Edward W. Moeley. 

 State of Ohio, Svmmit County, ss. 



Sworn to by the said Edward W. Morlet, before me, a Notary 

 Public, within, and for said County and State, and by him subscribed 

 in my presence this 23d day of May, a.d. 1878. 



Witness my hand and official seal at Hudson County and State 

 aforesaid this 23d day of May, 1878. 



H. B. Foster, 



Notary Public. 



I, Orlando Ames, of Somerville, in the Commonwealth of Massa- 

 chusetts, on oath depose and say, that in the years 1870, '71, and '72, 

 in the shop of the Boston Optical Works, of which Mr. E. B. Tolles was 

 Superintendent, I had charge of the work of construction of Micro- 

 scope-stands. That in the years 1870 and 1871 the first Microscope- 

 stand of his class A was made. That after it was otherwise completed, 

 I by Mr. Tolles' direction adapted to the stand a swinging arm to 

 carry a condenser at various obliquities to the optical axis of the 



