Thk Microscope. 11."» 



narrow disks are valueless ; the body of the turn table should 

 be supported on legs and not rest on a block of wood ; otherwise 

 it will not be steady. The patent removable hand rests sold with 

 turn tables may bring a profit to the manufacturers, and I should 

 think they would judging from the prices asked, but to the mi- 

 croscoijist they are only in the way. If the turn table is placed 

 directly in front of the operator, parallel with the edge of the 

 table, and the worker sits squarely up to the table, there will be- 

 no need of a removable hand rest. It is very important to learn 

 in the beginning that good work requires that a person shall sit 

 well in the chair and with full face to the table, and then place 

 the turn table as just stated. It is almost agonising to see how 

 some persons persist in balancing themselves on one corner of 

 a chair and attempt to direct the turn table toward all points of 

 the compass at once. When the operator and instrument are 

 both properly placed the brush must be held in the hand after 

 the manner of a pen, only it must make a more obtuse angle 

 with the slide than the acute angle a pen forms with the paper 

 What is also of importance is to remember to have the brush 

 touch the slide at the point in the imaginary ring which is further- 

 est from the operator. That is in a manner so that the brush point 

 the centre of the ring and a point in the median line of the 

 operator will form a line. 



My advice, based upon experience, is to avoid those turn tables 

 which have a spring self centring apparatus, as the spring will 

 soon wear out and leave the table only a plain one. Clips are a 

 convenience on any turn table, and I hope that some of the 

 heavy and light running turn tables which are now made with- 

 out them will soon be supplied with this convenience. When 

 the disk does not turn readily, or attempts to make music, it can 

 be remedied by removing it and washing both spindle and socket 

 with benzol or benzin. 



My greatest and in fact only objection to turn tables is the 

 exorbitant prices charged for them. Still I do not see how any 

 microscopist can aftbrd to work without one. 



