This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
It is the general practice of milkmen to furnish a monthly card on which the housewife marks the needs of the day and then hangs it outside of the door for the information of the driver. This card also serves as a record for checking the accounts of :he milk delivered during the month, and therefore it is desirable to protect it from snow and sleet.
In order to furnish this protection and at the same time make it unnecessary for any one to go outside of the door to hang up the card on stormy days, one of our readers has submitted the following plan which he has used for some time.
On the outside of the kitchen door, where the milkman is to deliver his bottles, this man has fastened an ordinary picture frame with glass but no backing except the door. Through the door and just below the upper edge of the glass is cut a thin slot inclining downward and outward so that the milk card can be easily pushed through the slot and thus be displayed behind the glass in the frame. By this protection it is kept free from mud, snow and ice. It is not necessary to step outside to place the card in the frame.