488 EXPERIMENTAL PHARMACOLOGY 



44. Turning lathe for metal. There are many varieties of these lathes on 

 the market, varying in price from about $50.00 to approximately $1000.00 

 for such sizes as might be bought by the department. It is strongly 

 advisable not to buy a low-priced, cheaply constructed lathe. The author 

 has found the Star lathes (Seneca Falls Manufacturing Company, Seneca 

 Palls, New York) very satisfactory. Small lathes are to be avoided, 

 and the 16 inch (or 13 inch) swing size is better than the 11 inch, which 

 in turn is to be preferred rather than the 9 inch size. The lathe should 

 have automatic longitudinal and cross feeds, should be able to cut a 

 large range of threads and should be so constructed that a full set of 

 attachments, such as a taper cutting device, a milling device, etc., can be 

 readily attached at any later date. Exposed gear wheels around the 

 head stock are to be avoided and especial care should be taken to see 

 that changes from one thread to another in the thread-cutting device 

 can be made quickly and easily. In the best lathes this is largely done 

 by simply shifting levers, in the cheaper lathes an unwieldy number of 

 separate and independent iron gear wheels must be taken off and re- 

 placed by others to produce most or all of the shifts in threads. 



It is very convenient to have a motor-driven lathe, i.e., one with the 

 driving-motor attached directly to the lathe. This makes the lathe en- 

 tirely independent of the other machinery in the shop, but it is slightly 

 more expensive (if several other motor-driven machines are used) than is 

 the arrangement whereby one motor is used to drive a power shaft from 

 which all the machinery in the shop is actuated. This also applies to 

 most of the other motor-driven machines. 



A few attachments are usually sold with the lathe but 

 many others are always needed. A full set of turning tools 

 should be secured, and the following- are needed : 



46. Three chucks Cushman, universal, one as large as the lathe will carry, 

 . one 2^ inches and one about 4 inches in diameter. Each chuck should 



have 2 sets of jaws. Chucks are very expensive and if only 1 can be 

 bought this should be about 4 inches in diameter. In addition a Jacob's 

 drill chuck (holding drills at least up to % inch in diameter) should 

 bo purchased. This chuck should be fitted to the lathe. 



47. Armstrong cut-off tool (and bits), Armstrong boring-out tool, and a 

 threading tool. 



48. Crotch center, screw face plate, tail face plate, two lathe dogs, and a 

 nurling tool. 



49. A power-driven drill press. It is convenient to have the motor attached 

 to the drill press but this is more expensive than the power shaft ar- 

 rangement. The drill press should have hand feed (and power feed 

 also if possible) and should drill to the center of at least a 12 or 14 

 inch circle (or larger if possible). 



50. A wood lathe. (Burnishing, buffing and polishing may also be done by 

 especially attaching buffing wheels to the wood lathe.) 



51. A shaper (planer) for metal. 



52. A power hack saw ($25.00;. 



53. A milling machine ($500.00). 



54. If much wood work is done a wood former ($20.00) may also be useful. 



