make a periscope ( PERISKOP)

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1. https://leisure.onehowto.com/article/how-to-make-a-periscope-out-of-cardboard-1969.html

2. https://www.exploratorium.edu/science_explorer/periscope.html


3. http://www.popularmechanics.com/technology/a8725/early-adopter-how-to-build-a-periscope-15075808/


4. http://www.unawe.org/activity/eu-unawe1318/


5. http://www.popularmechanics.com/technology/a8725/early-adopter-how-to-build-a-periscope-15075808/


6. http://therandomgirl03.blogspot.my/2015/09/visual-brainstroming-ideas-on-who-to.html


7. http://www.wikihow.com/Make-a-Periscope


8. http://www.topspysecrets.com/how-to-build-a-periscope.html


9. https://www.teachervision.com/light-color/make-periscope

10. http://www.devon.gov.uk/m_xmakesperiscope.htm


11. https://www.sciencetoymaker.org/periscope/asmblCD.htm


12.  http://www.arvindguptatoys.com/toys/periscope.html


13. http://scienceillustrated.com.au/blog/in-the-mag/do-it-yourself-science-projects-make-a-periscope/


14.http://www.webinnate.co.uk/science/week8.htm

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https://kohscience.blogspot.com/2018/08/periskop.html