COLLECTIONS IN ECONOMIC GEOLOGY AND METALLURGY. Ill 



(;?) Ceiueiit coppor, coiuprctised in an ordinary bnck niachiue preparatory to niclt- 

 in<j into ingots. ("29945.) 



(4) Ceiueiit copper, coniprtissod by hydraulic pressure preparatory to m(3ltini; into 

 iuyota. (-^9946.) 



(5) lugot, obtained from the pressed cemeut copper by a single fusion in a reverber- 

 atory furnace. (29947.) 



Application of Copper. 



A single illustration of the api)licatiou of copi)er in the rolling of rods 

 and i)lates and tlie coating of the latter witli other metals, as practiced 

 at the works of the Ansonia Brass and Copper Company, Ausonia, 

 New Uav'en County, Connecticut, is illustrated by a collection taken by 

 Mr. L. Powe and Mr. Henry Cooper, 1884. 



Rod roUitKj. 



(1) Rolled hot, shows scales of oxide formed during the heating and rolling, 

 (fillaa.) 



(2) Rolleilhot, has been pickled iu dilute sulphuric acid to remove the scale of oxide 

 of copper formed during the heating and rolling. (51184.) 



(;?) Rolled hot, pickled and then liuished by cold rolling. (54;5G2. ) 

 (4) Rolled hot, pickled, rerolled hot and, after cooling, drenched with dilute ani- 

 monia, heated toa dull red and (lueuched iu cold water to remove the scale. (51185.) 



J'late rolling. 



(1) Rolled hot, shows scale of oxide formedduriug the heating and rolling. (54359.) 



(2) Rolled hot, has been pickled in dilute sulphuric acid to remove the scale of oxide 

 of cojiper formed during the heating and rolling. (54357.) 



(3) Rolled hot and pickled and then finished by cold rolling. (54358.) 



(4) Rolled hot, pickled, rerolled hot and, after cooling, drenched with dilute am- 

 monia, heated to a dull red and ([uenched in cold water to remove the scale. (5436U.) 



(5) Scale, from the quenching of plate. (543ol.) 



Sheet copper. 



(1) Hard-rolled. Hard rolling is passing the [date a few times through the rolls 

 to harden and temper it. (543()7. ) 



("2) Hard-rolled, showing spring tomp<!r. (54369.) 



(3) Cold-rolled, soft or annealed. (.54370.) 



(4) Hard-rolled, tinned. (54364.) 



(5) Cold-rolled, tinned. (54366.) 

 ((i) Patent planished. (.54368.) 



(7) Tinned and patent planisliod. (54365.) 



(8) Patent nickel plated. (.54363.) 



(9) Patent nickel plated and tinned. (54371.) 



(10) Silver plated, to be used in gold amalgamating mills; contains 1 ounce of 

 silver per scjuare foot. (54372.1 



