TABLE OF ABBREVIATIONS, ETC. 



l.p. low power. 

 h.p. high power. 

 1. hand lens. 



Dem. refer to the teacher, 

 cm. centimeter. 



Sketch. When this term is used, a rapid drawing on the note paper is 



intended. 

 Drawing. When this term is used, a careful outline drawing is intended. 



This is to be made on the drawing paper with the hard 



pencil or a pen. 

 Diagram. This indicates a drawing in wliich the relation of the parts is 



shown, rather than the form. 



LABORATORY AXIOMS. 



1. Never make a line in a drawing unless it means something. 



2. Always name the parts of a drawing, sketch or diagram. 



3. Never be content with a dull drawing pencil. 



4. Always use a hard pencil in drawing. 



5. Make all drawings natural size, unless otherwise directed. 



6. Be orderly and systematic in your work. 



7. Ask questions if there is anything you do not understand. 



8. ])o not be satisfied to answer questions simply "yes," or 

 Give reasons for your conclusions whenever possible. 



