Calendar: 1848-1849 Page 271

APPLIED SCIENCES 209 and 13 are two equal beams supported at and Β and jointed at DC vertical piece AC and CB two equal connecting rods show bow to find bow strong the rods should be to bear given weight at the weights and lengths of DB DC AC and being given Β Ε is roof composed of four equal beams determine under what circumstances the beams will remain it rest without any tie beam except What are the laws of friction and how may they be proved by experiment 10 block of given weight being placed on rough horizontal plane find the least iorce that will cause it to slip and the direc- tion in which that force must act the coefficient of friction being £ IV nm'5'tn What is the principle on which the common thermometer acts How are the fixed points required for its graduation found What is the cause that those temperatures are constant Describe the method of taking the specif gravity of gas Mention the precautions needed to ensure accuracy