A Manual of Experiments in Elementary Science: Teacher's Edition (1918)
Curtis, Francis D. · Charles E. Merrill Company · leaf 127
r) in the air. Dust and water vapor are important components of the air. No. 75. PREPARATION AND STUDY OF CARBON DIOXIDE (C02) Materials. — Carbon dioxide generator arranged with funnel tube or thistle tube and delivery tube, as in Fig. 68 ; marble or limestone chips ; wide-mouth bottle ; beaker or… … Fig. 68 (S). have only concentrated HC1 in the laboratory, add a little water before adding the acid through the thistle tube. After the effervescence has con¬ tinued for a few moments — long enough to expel the air from the generator and delivery tube, place the end of the deliver
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