The Piece of Pipe Gives a Leverage Equal to That of a Large Pipe Wrench
Hand Propeller-Wheel Attachment for a Rowboat
The rear fork of an old bicycle frame, with the crank hanger attached, and the rear hub constitute the main parts of the propelling device. One of the cranks is cut from the hanger and a bracket attached to the frame, as shown, for making it fast to the stern of the boat. Two propeller blades are bolted to the rear hub. A rudder is fastened to the rear tube of the frame with hooks and eyes so that it can be turned with a handle at the top, or with ropes run to a wheel. The illustration shows the connection of the device to a boat.—Contributed by Berge Lion, Fresno, Cal.
The Rear Fork of a Bicycle with Its Parts Constitutes the Main Propeller Attachment
An Attached Back for a Photographic Printing Frame
In using the ordinary photographic printing frame with a spring-pressure back, the back must be entirely removed from the frame to put in the paper, and as this operation is carried on in a dim light, the back is often mislaid, causing no little inconvenience and delay. To do away with this annoyance, I placed at one end of the frame, as shown in the sketch, a second hinge made of cloth or any pliable material. When the pressure springs are released, the back swings down on this auxiliary hinge, and after changing the papers, it is instantly closed by a slight movement of the hand, making it very rapid and easy to use.—Contributed by Thos. L. Parker, Wibaux, Mont.
The Back, being Hinged to the Frame, Prevents It from being Mislaid