1895 THE MICROSCOPE 91 



QUESTIONS ANSWERED. 



NoTB. — Dr. S. G. Shanks, of Albany, N. Y , kindly consents to receive all sorts of ques- 

 tions relating to microscopy, wh'tJw usknl by professionals or amateurs. Persons of aL 

 g ades of experience , from the hegt-mer upwa>d, ate w Icotne to the benefits of this depuf' 

 ment. The questions are numbend /or juture reference. 



— ■ — -rp 



225. h there any apparatus for making enlarged photos of mi- 

 nute insects f How could a house fly he photographed to ten times its 

 natural size f — F. L. H. 



Any microphotographic outfit will protluce photos of insects 

 or any other micro object. A sufficient light and a proper ex- 

 tension of the camera body will give any size of picture desired. 

 A one inch objective at 125 inches distance from the ground 

 glass, or a two inch objective at 25 inches, will magnify an ob- 

 ject 10 diameters. 



226. How can I best get micro -photo graphic apparatus to fit on a 

 tube vertically so as to photo objects mounted temporarily such as the 

 desmids, diatoms and eggs of insects f — F. L. H. 



Arrange a small platform with a central hole for the micro- 

 scope tube to pass easily through, and fitted with legs, like a 

 stool. Place the camera, front down, on this support, fasten the 

 camera to the platform with screws ; or if preferable, nail strips 

 of wood to keep the camera central and allow easy removal. 

 When the microscope and object are ready, place the platform 

 and camera over it and focus the object on the ground glass as 

 usual. Objects in fluid will require extreme steadiness of ap- 

 paratus and a cloth-screen around the lamp, so that exposure 

 can be made without causing vibrations in the object or camera. 



227. Do you hold to the good opinion of Friedlander'' s Microscop- 

 ical Technology by Howell, expressed in The Microscope of January, 

 1887 f—M. D.J. 



Dr. Stowell was the editor at that time and expressed the 

 opinion. We are not acquainted with the book. Doubtless 

 the advances in knowledge since 1887 have rendered it some- 

 what obsolete. 



228. Where can I obtain a catalogue of Microscopes mxmufact- 

 wed by Siebert f—W. G. T. 



