A Manual of Experiments in Elementary Science: Teacher's Edition
A 1918 teacher's manual of laboratory experiments for elementary science students, written by Francis D. Curtis and published by Charles E. Merrill Company in the United States. Its pictures are plain line drawings of apparatus on stands: a test tube over a burner with water, an inverted jar over a tumbler of water, a flask with a thermometer, and a thistle-tube gas generator. A designer could draw on their clean schematic labelling and tidy lab-equipment geometry for instructional diagrams.
