216 INDUSTRIAL ELECTRICITY 91a-91c. Industrial Electricity. For plant maintenance electricians. Instruction is given in elementary electricity and magnetism, series and parallel circuits, direct current motors and generators, fundamentals of alternating current, alternating current machinery, armature windings, measuring instruments, and industrial electronics. Four quarter hours. 92a-92c. Industrial Electricity. Continuation of 91. 03a-93c. Industrial Electricity. Continuation of 92. 94a-94c. Industrial Electricity. Continuation of 93. GUN REPAIR 61. Gun Repair. A course which is offered to those who want practical experience in machine work, the manufacture of small parts and accessories, and the repair of stocks, barrels, etc. One quarter hour. 62. Gun Repair. A continuation of Gun Repair No. 61. One quarter hour. 63. Gun Repair. A continuation of Gun Repair No. 62. One quarter hour. 64. Gun Repair. A continuation of Gun Repair No. 63. One quarter hour. 65. Gun Repair. A continuation of Gun Repair No. 64. One quarter hour. 66. Gun Repair. A continuation of Gun Repair No. 65. One quarter hour. MACHINE TOOL 71. Elementary Lathe Operation. A course designed for those who have little or no machine shop training. It is a basic course, giving the fundamentals of lathe operation, such as tool grinding, setting up apparatus, chucking work, center drilling, radii and fillet forming, knurling, external threading, drilling, boring, reaming and taper turning. Three quarter hours. 72. Machine Operation. A course designed to give training in advanced lathe work, face plate work, line boring, steady rest and follower rest work, multiple threads, acme and square threads, cat head and spider work, jig work for turning special parts. Precision measurements are also stressed. Experience is given in bench work, layout, application of steel rule, micrometer, verneer scale, dial indicator, hack sawing, filing, chipping and assembly of parts. Three quarter hours. 73. Machine Operation. An advanced course including lathe work, incorporating application of training in elementary lathe operation and machine operation. Also included are the following: Drilling machine operation, layout work, guiding a drill, clamping work, holding devices, sharpening drills, precision drilling, drilling mating parts, spot facing, counter boring, reaming, boring, tape and tapping. Three quarter hours. 217 74. Machine Operation. The course in shaper and planner operation includes adjusting and setting up shaper, shaper plain surface, tool grinding, shaping angles, irrigular shapes, parting, cutting contour surfaces, cutting key-ways and shaping slots. Planer work including methods of holding work, measuring and gauging, planing long plain surfaces, angular cuts, cutting slots and other operations similar to shaper work. Three quarter hours. 75. Machine Operation. The course is elementary Milling Machine Operation includes: Milling plain surfaces, angular milling, end milling, cutting key-ways, cutting hexagons and irregular shapes, milling form shapes, use of vises, clamping to table, holding devices, slot cutting, step milling, gang milling, straddle milling, drilling, boring, reaming, increment cuts, cut and try methods, and other typical indexing operations. Three quarter hours. 76. Machine Operation. The course is advanced milling machine operations includes spiral milling, cutting cams, angular indexing, differential indexing, use of rotary milling, vertical milling, use of universal attachment, slotting attachement, cutting splines, cutting flutes in reamers and taps. Three quarter hours. 77. Machine Operation. A course designed to give experience in spur gears, bevel gear, and spiral gear cutting. Calculations for these gears, use of handbook and teaching aid are also stressed. Heat treating of machined parts, normalizing annealing and hardening tempering, case hardening, hardness testing, pack hardening. Elementary metallurgy is also studied. Three quarter hours. 78. Machine Operation. Metal sawing includes technique of band sawing, setting up machine for sawing, filing and polishing, straight sawing, contour sawing, selection of blade for job, welding blades, band filing, polishing, two dimentional sawing, cutting out, stamping dies—Layout work, precision sawing to lines, using magnifying glass cut a male and female die on do-all saw, punch press work, setting up die shoe. The operation of the punch press, using a die set up, is also stressed. Three quarter hours. 80. Machine Operation. The course in advanced machine proc- cesses includes use of turret tool post in duplication parts, set up operational sequence on lathe jobs, set up production time, machining using jigs in drill press, milling machine and lathes. 81. Machine Operation. A course in jigs and fixtures fabrication, stressing the use of various machines in shop, including lathe, shaperk milling machine, metal band saw, drill press, simple dril jig, lathe jig, milling machine jig. 82. Machine Operation. A course in surface grinder operation, including care of machine, setting up machine for grinding, coolants used, correct wheel for the job, cutting feeds of speeds, surface finish, grinding plane surfaces, form grinding, grinding angular surfaces, truing and dressing wheels, balancing wheels and face grinding. 83. Machine Operation. A course in cylindrical grinding operation, including grinding wheels, truing and dressing, work holding devices, plain grinding, taper grinding, shoulder grinding, internal grinding, form grinding, coolants and cutting compounds.