Line on writing or desktop has “property” in the right time to get lost in the pile of papers, drawings, details. Fasten to the edge of the table, two cloves, and even better — screw two small screws with round head (not clung to); in the line also make two cut so that they easily included screws. Now the ruler will always literally at hand and never lost.
Recommend to read
ELECTRONIC METRONOME
It is used in teaching music in rhythmic gymnastics, in experiments in physics etc. a Metronome, a scheme which offers Bulgarian journal "Radio Television Electronics" (see Fig.), gives...
OFF — FORGOTTEN
To control the timely switch off the light in podsol tion spaces (storerooms, bathrooms n toilet komnatah) on the status of the switch is very inconvenient. For this purpose in my...
