It is a very small amount of money to do so much good with, and it is to be hoped that people who have $15 to spare will send it to the Junior Republic to help the good work along.
G.H. Rosenfeld.
INVENTION AND DISCOVERY.
Recording Thermometer.—This is a very interesting little machine, especially so at this time of year when the temperature is a constant subject for thought.
It is a recording thermometer, and consists of a thermometer and a recording disk. By means of cleverly arranged mechanism the rise and fall of the mercury is used as the motor power, and registers the changes in temperature on an indicator card. Other simple mechanism works a rotary drum by which this indicator card is carried.
Pencil Sharpener.—This is another helpful little contrivance, a pencil sharpener. There are already numberless things of the kind, some of which answer for a time, some not at all, and all being made for the purpose of sharpening the pencil to a kind of regulation point. For my own part I have always preferred a good sharp knife, or the simple reason that I could then make exactly the kind of point suited to the work to be done. The purpose of the new pencil sharpener is evidently the same. This contrivance is a small and handy block for holding the pencil in position for the knife, and has a cutting guide which will be a joy to people who are awkward in using the knife.