xii Contents 



PAGE 



B. BENDING AND BLOWING 



I. MATERIAL 79 



II. TOOLS 80 



III. EXERCISES IN GLASS BENDING 87 



IV. EXERCISES IN GLASS BLOWING 90 



SECTION IV 



GENERAL 



I. THE LABELLING OF BOTTLES 119 



II. THE SILVERING OF GLASS 123 



III. PLASTER CASTING 126 



IV. ELECTROTYPING 129 



V. THE CLEANING OF MERCURY 133 



VI. THE CARE OF LABORATORY IRONWORK 134 



VII. THE CARE OF BENCH TOPS 136 



VIII. USEFUL CEMENTS 136 



IX. PAINTS, STAINS, AND VARNISHES 139 



X. BURETTE STOPPER GREASE 142 



XI. POLEFINDING PAPER 142 



XII. LITMUS SOLUTION 142 



XIII. COLOURING LIQUID FOR HYDROSTATIC EXPERIMENTS . 142 



XIV. FRENCH POLISHING 143 



XV. GRADUATION AND CALIBRATION OF APPARATUS . . . 146 



XVI. SCALE COPYING 153 



APPENDIX I. THE MAKING OF LANTERN SLIDES 157 



,, II. OPTICAL PROJECTION 166 



,, III. TABLES OF USEFUL DATA 172 



INDEX 



189 



