AN INEXPENSIVE TUKN-TABLE. 



107 



Fic I. 



which can be squared on the circular-shaped arbor (as at F', Fig. 



2) by the use of a file, and then fixed by a small wedge. J is a 



hole in the upper piece of wood that forms the hand-rest, and 



should be carefully bored, G being a small hole in the lower piece 



of wood into which to let the smoothly-filed and pointed end 



of the arbor. H is a clamp for fixing to an ordinary table or 



board, and can be bought for a few pence, or made at home. To 



rotate the table, a bow such as watch-makers use, should be 



constructed, and the stretched string passed round the grooved 



wheel (as at M, Fig. 2), the bow being worked backwards and 



forwards with the left hand, whilst the right hand is employed in 



finishing the slide. Fig. 3 shows how the glass slip is attached to 



the wheel. At L a deep notch is cut in the circumference of the 



wheel, and a piece of string, 10 inches long, attached at one end, 



being kept by a knot, on the under side of the wheel. The slip 



K is then centred as accurately as possible and the string brought 



over the top, then under the wheel, following the directions of the 



arrow-heads, over the other end of the slip, and again under the 



wheel, until it is brought over the deep notch at L and secured by 



a second knot already made at the other end of the string. It 



will be found convenient to cut 8 of these notches upon the 



circumference of the wheel at equal distances from each other. 



I submit this simple and inexpensive turn-table in the hope 

 that it may serve those who, like my friend, are willing, but 

 unable to indulge themselves with the materials by which 

 properly to prosecute their loved work of mounting preparations 

 for microscopic examination. 



