216 THE AMERICAN' MONTHLY [Aug., 



10.— A METAL TABLH— FIGl*KES 11 AND 12. 



One needs a Email table, of metal, to heat slide? on. Get a 

 piffle of heavr sheet iron 3x5 inches or of anj' other size you 

 wi-h. 



In each comer, make a hole at a point i inch from the sides 

 and ends. Cu' " '"the same metal of wliich the table is made 



to\fe h inch i 4 or 5 inchf-p long. Rivet one to each 



f^mer of the table ^Fig. 11 ). The figure (12^ shows the man- 

 ner ot riveting. 



11.— WAKH-B^/rrLES.— FIGUKE 13. 



A wash-V>ottle is a convenience. Get a wide-mouth bottle, — 

 say a quinine bottle. Bore two quarter-inch holes in the cork. 

 Get a glai>*i tu>>e \ inch in diameter, if you can. If not, one of 

 tin. iron, or brass will do. V>ut glass is to be preferred h)ecau8e 

 more easily kept clean. Also, get two or three feet of \ inch 

 rubl>er piping. By studying the illustration, it will be easily 

 understrxni '^Fig. IZ). Uf>on h»lowing at a, the air is forced in- 

 U) the l>ottle. and it for^-s the water out at b, through the glass 

 tu\te. e. If the rubl>er tube a. be 2 or 'i feet long and the rubh»er 

 tul>e, b, the same length, it will be found of greater convenience 

 than V^ythe old way. Thie VKjttle can remain on the table. At b, 

 there should be a glass nozzle, r/. like the pippet- before des- 

 cribe<l. 



12.— CXA'DE-N'HI.NG LK.N'.S.— FlGUJiK 14. 

 If you have a buaiing glass or a reading glass with a liandle, 

 you can make a wf>oden stand that will answer every purpose. 

 Indeed, some j^refer them in order t'j jjut the money int^j some- 

 thing that can not be made so easily. Your burning or reading 

 glass may not give as good results as a glass purposely made, 

 hut g^x>'l results can be obtained especially by lamp-light. We 

 will supfx>w; your lens is as shown in Fig. 14. 



]:i.~iX)Sl)KSHlS(iLKSH HTA.VD.— FlGl'KF^H 1',— 21, 2:i. 



Not all are ex|>ected U) have nor can afford a complicated ar- 

 rangment, 8ome have a very large number of adjuHtments, 

 Home have as many as twelve motions or twelve adjustments 

 with moving the base. This is very convenient but is costly. 



For the base, take a bhx;k of hard wood such as oak, maple, 

 etc. Cut it i inch'-s thick, 2i wide and 5 long. Cut a hole li 

 inch^fS from one end afid in the cenU-r CFig. 21;, m;ike it either 



