num_pages: 148
description: Presents instructions for creating a variety of items, including a pinhole mirror, a hydraulic arm, a modulated coil, and a periscope with a twist.
language: English
title: Square Wheels and Other Easy-to-Build, Hands-On Science Activities
titlecomplete: Square Wheels and Other Easy-to-Build, Hands-On Science Activities (An Exploratorium Science Snackbook)
publisher: Exploratorium Store