Aluminium foil foil rolling mills to the desired thickness, or by continuously casting and cold rolling. To maintain a constant thickness in aluminium foil production, beta radiation is passed through the foil to a sensor on the other side. If the intensity becomes too high, then the rollers adjust, increasing the thickness. If the intensities become too low and the foil has become too thick, the rollers apply more pressure, causing the foil to be made thinner. The continuous casting method is much less energy intensive and has become the preferred process. For thicknesses below , two layers are usually put together
Kitchen utensil utensils recommended to the aspiring householder in cookbooks as the century progressed. Earlier in the century, in 1828, Frances Byerley Parkes had recommended a smaller array of utensils. By 1858, Elizabeth H. Putnam, in "Mrs Putnam's Receipt Book and Young Housekeeper's Assistant", wrote with the assumption that her readers would have the "usual quantity of utensils", to which she added a list of necessary items: Copper saucepans, well lined, with covers, from three to six different sizes; a flat-bottomed soup-pot; an upright gridiron; sheet-iron breadpans instead of tin; a griddle; a tin kitchen; Hector's double boiler; a tin coffee-pot for