While previous work has found success in deploying visualizations as museum exhibits, differences in visitor behaviour across varying museum contexts are understudied. We present an interactive Deep-time Literacy Visualization Exhibit (DeLVE) to help museum visitors understand deep time (lengths of extremely long geological processes) by improving proportional reasoning skills through comparison of different time periods. DeLVE uses a new visualization idiom, Connected Multi-Tier Ranges, to visualize curated datasets of past events across multiple scales of time, relating extreme scales with concrete scales that have more familiar magnitudes and units. Museum staff at three separate museums approved the deployment of DeLVE as a digital kiosk, and devoted time to curating a unique dataset in each of them. We collect data from two sources, an observational study and system trace logs, yielding evidence of successfully meeting our requirements. We discuss the importance of context: similar museum exhibits in different contexts were received very differently by visitors. We additionally discuss differences in our process from standard design study methodology which is focused on design studies for data analysis purposes, rather than for presentation. Supplemental materials are available at: https://osf.io/z53dq/?view_only=4df33aad207144aca149982412125541
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