A potometer measures how factors such as light, temperature, humidity, light intensity and wind will affect the rate of transpiration. The main type of potometer is the 'bubble' potometer shown in Figure Figure 6.
Physicians recommended against the practice because they did not want medicines associated with punishment. A heavy dose of castor oil could be used as a humiliating punishment for adults, especially political dissenters. Colonial officials used it in the British Raj (India) to deal with recalcitrant servants. Belgian military officials prescribed heavy doses of castor oil in Belgian Congo as a punishment for being too sick to work.
Pure castor oil, which is extracted from castor beans, is an odorless and tasteless oil that is used for a variety of skin ailments. In recent years, castor oil has been used in conjunction with other natural oils, such as rosemary oil and peppermint oil, to make a safe and effective natural insect repellent. Castor oil. Other natural oils, such as rosemary, lemon eucalyptus, cedar, cinnamon and geranium oils. Rubbing alcohol.