6 
15. Place in the notes the following: 
(а) Make of the microscope. 
(б) The number of the ocular. 
(c) The numbers of the objectives. 
( d ) The magnifications obtained with the ocular and each of the 
objectives on the microscope. See table below. 
(e) By what characteristic can one recognize at a glance the 
lowest power objective? the oil immersion objective? 
(f) Which way must the coarse adjustment be turned to raise the 
tube? 
( g ) Which way must the fine adjustment be turned to raise the 
tube? 
( h) The condenser can be raised and lowered in two ways. What 
are they? 
(i) The image of the object viewed is an inverted one. What 
effect does this have on the direction the slide must be 
moved in order to move an object seen in the field from left to 
right? 
(/) The values given in the table of magnification refer to the 
apparent increase in length of a line as viewed under the 
microscope—linear magnification. From these values how 
would the magnification of an area be obtained? 
16. The first five minutes of the next period will be devoted to a written 
quiz on the names applied to the various parts of the microscope and the 
purpose of each part. 
TABLE OF MAGNIFICATIONS 
(tube length of 160 m. m.) 
Objectives 
Oculars 
4x 
5x 
8x 
lOx 
(2 in.) 
(2 in.) 
(1 in.) 
(1 in.) 
16 m. m. (f in.) — 
40 
50 
80 
100 
4 m. m. (£ in.)- 
176 
220 
352 
440 
1.8 m. m. (tV in.). 
380 
475 
760 
950 
